This is such an amazing and universal misunderstanding I think it is humorous,
The solution to form issues and gaining a lot of size through intensity is very simply:
Do front squats.
It is impossible to this exercise incorrectly without falling down or breaking your collarbone, your form will be perfect or you will land on your ass. You use half the weight and double the intensity.
I honestly think this exercise is too hard for most guys and they avoid it, and simply do back squats.
Front squats are serious and you get serious results.
PS
I think back squats are fine for girls and people that normally use machines