I'm extremely confused about this topic as each source gives a different opinion.
Here, for instance, but also in this video, it is said that the barbell must touch the shins. The first source says:
The bar should stay in contact with your shins and thighs the entire way up. This leg contact makes sure the bar path is over the middle of your foot.
But, there exists the same number of sources which say it must not! For instance, here it is written that:
At this point, if we'd were to keep our back nice and tight, and proceed on performing the lift by performing the exercise through leg drive, the bar would ideally move in a vertical line, which means it would NOT touch the shins at any point of the lift, since they would verticalize as we come up through the movement as well.
And this image is provided:
Here a bit distance between the bar and the shins is suggested too, in order to avoid bar hitting knees.
Finally, in this video, from the 8:30 mark, it seems that the bar should touch the shins at the bottom but not on the way up.
Which is the truth and why?