Which validates my point about squats not building your legs.
Any exercise will build your legs if you are meant to have big legs.
it depends on execution
the more upright the torso the more the knees will travel forward
an olympic full squat barely breaks paralel
because the knees travel so much forward and so the shin bone inclines to the front and lowers the knee height also and so the thigh bone ends up horizontal when knee is fully folded
this way the quads take a big load of the work almost like leg extensions
true story
many olympic lifters have phenomenal quads
but hack squats machine are more practical
perfect example, this is his full depth yet the thigh is parallel
massive load on the quads
