There is no meaningful standard for ankle flexibility other than "Can I do what I want to do?" I'm unsure whether it's possible to have
problematically-excessive ankle flexibility.
"We squat primarily to gain strength, not primarily to practice
"real-life" activities. The distinction is important."
I could not disagree more with those two statements and based on the high quality of some of your answers I'm surprised you'd write that. I'm posting this not to piss you off but hopefully show you a huge piece of the puzzle you're at least somewhat not fully grasping...
Below was written by Grey Cook. There is no one I'm aware of higher in the Athletic Movement Field.
"If you’re squatting wrong and it’s not killing you, it can make your hip flexor spasm stronger. It can make your swayback worse. It can make your rounded shoulders harder to bring back.
When you go into your workout with underlying dysfunction (i.e. limited DF as the original posted asked about), remember this:
Exercise is trial by fire. We want to optimize the situation and then
temper the steel. We don’t do it the other way around.
That’s sort of what’s behind the statement. It’s not a contradiction. When I’m talking corrective exercise, there’s not a lot of stress or load, because we should be learning to manage bodyweight. Managing balance without a load is natural. Everybody does that as they’re learning to walk.
What’s unnatural is to load a squat that doesn’t have any integrity to it. There’s no situation where a baby would think, ‘I can’t really squat that good right now. Maybe put a mini backpack on me and see if that helps my balance?’
This is another form of what we’re doing at the gym when we throw on quantity to clean up quality. If you want to clean up quality, clean up quality. If you want to reinforce quality, then throw on quantity.
The idea is if you have less-than-optimal integrity in your getup, go light until you recapture integrity. Then get heavy again, because that’s the best way to see if you can hold integrity and manage quality.
Once quality has an acceptable base, start exploring greater levels of quantity—strength, speed, stamina, endurance—and see if you can maintain a minimum level of quality."