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Relatively speaking, it could be the other way around too -- perhaps instead of "weak forearms", you just have very strong lats, such that in order to "feel them", you have to work out the forearms + elbow-flexors (brachialis, brachioradialis) a lot more...

But regardless, from the standpoint of biomechanics, all pullups technically have a "greater mechanical advantage" in favor of elbow flexion (brachialis + brachioradialis) over shoulder extension (lats + rear-delts) from the bottom of a "dead hang" position all the way up until your upper arm is "horizontal" or parallel to the ground. And only from there, until you reach the top of the movement with your chin way above the bar, does the mechanical advantage for shoulder extension exceed that of elbow flexion.

And so, since the body generally chooses the "easiest way possible" to do an exercise, it's not surprising you end up feeling the exercise primarily in the arms/forearms rather than your back/shoulders -- especially if the latter are already too strong for the former to keep up with them during the exercise!

This is actually what is expected from the standpoint of biomechanics.

All pullups technically have a "greater mechanical advantage" in favor of elbow flexion (brachialis + brachioradialis) over shoulder extension (lats + rear-delts) from the bottom of a "dead hang" position all the way up until your upper arm is "horizontal" or parallel to the ground. And only from there, until you reach the top of the movement with your chin way above the bar, does the mechanical advantage for shoulder extension exceed that of elbow flexion.

And so, since the body generally chooses the "easiest way possible" to do an exercise, it's not surprising you end up feeling the exercise primarily in the arms/forearms rather than your back/shoulders -- especially if the latter are already too strong for the former to keep up with them during the exercise!

Relatively speaking, it could be the other way around too -- perhaps instead of "weak forearms", you just have very strong lats, such that in order to "feel them", you have to work out the forearms + elbow-flexors (brachialis, brachioradialis) a lot more...

But regardless, from the standpoint of biomechanics, all pullups technically have a "greater mechanical advantage" in favor of elbow flexion (brachialis + brachioradialis) over shoulder extension (lats + rear-delts) from the bottom of a "dead hang" position all the way up until your upper arm is "horizontal" or parallel to the ground. And only from there, until you reach the top of the movement with your chin way above the bar, does the mechanical advantage for shoulder extension exceed that of elbow flexion.

Thus, since the body generally chooses the "easiest way possible" to do an exercise, it's not surprising you end up feeling the exercise primarily in the arms/forearms rather than your back/shoulders -- especially if the latter are already too strong for the former to keep up with them during the exercise!

Relatively speaking, it could be the other way around too -- perhaps instead of "weak forearms", you just have very strong lats, such that in order to "feel them", you have to work out the forearms + elbow-flexors (brachialis, brachioradialis) a lot more...

But regardless, from the standpoint of biomechanics, all pullups technically have a "greater mechanical advantage" in favor of elbow flexion (brachialis + brachioradialis) over shoulder extension (lats + rear-delts) from the bottom of a "dead hang" position all the way up until your upper arm is "horizontal" or parallel to the ground. And only from there, until you reach the top of the movement with your chin way above the bar, does the mechanical advantage for shoulder extension exceed that of elbow flexion.

And so, since the body generally chooses the "easiest way possible" to do an exercise, it's not surprising you end up feeling the exercise primarily in the arms/forearms rather than your back/shoulders -- especially if the latter are already too strong for the former to keep up with them during the exercise!

Relatively speaking, it could be the other way around too -- perhaps instead of "weak forearms", you just have very strong lats, such that in order to "feel them", you have to work out the forearms + elbow-flexors (brachialis, brachioradialis) even more...

But regardless, from the standpoint of biomechanics, all pullups technically have a "greater mechanical advantage" in favor of elbow flexion (brachialis + brachioradialis) over shoulder extension (lats + rear-delts) from the bottom of a "dead hang" position all the way until your upper arm is "horizontal" or parallel to the ground. And only from there, until you reach the top of the movement with your chin way above the bar, does the mechanical advantage for shoulder extension exceed that of elbow flexion.

Thus, since the body generally chooses the "easiest way possible" to do an exercise, it's not surprising you end up feeling the exercise primarily in the arms/forearms rather than your back/shoulders -- especially if the latter are already too strong for the former to keep up with them during the exercise!

Relatively speaking, it could be the other way around too -- perhaps instead of "weak forearms", you just have very strong lats, such that in order to "feel them", you have to work out the forearms + elbow-flexors (brachialis, brachioradialis) a lot more...

But regardless, from the standpoint of biomechanics, all pullups technically have a "greater mechanical advantage" in favor of elbow flexion (brachialis + brachioradialis) over shoulder extension (lats + rear-delts) from the bottom of a "dead hang" position all the way up until your upper arm is "horizontal" or parallel to the ground. And only from there, until you reach the top of the movement with your chin way above the bar, does the mechanical advantage for shoulder extension exceed that of elbow flexion.

Thus, since the body generally chooses the "easiest way possible" to do an exercise, it's not surprising you end up feeling the exercise primarily in the arms/forearms rather than your back/shoulders -- especially if the latter are already too strong for the former to keep up with them during the exercise!