Surely the whole point of going deeper is to get a tighter hip angle, which will increase hip ROM, and pc activation. Putting plates under heels or using oly shoes raises the heel and allows you to get deeper, but by raising the ankles and closing the knee angle rather than allowing for a tighter hip angle. So really a squat to full depth with ankle elevation is the same as a squat with none, to less depth.
Am I missing anything? Or is this already well known info.