It’s ok on the knees as long as have the ankle mobility to get low enough in right position but being honest if talking purely for bodybuilding I feel I got better quad development going just above parallel but can’t do it now as soon as approach working weights body just automatically sinks them low.
I think this is the answer - has to do with the persons personal mobility profile.
I went through a phase over the winter going all the way to the bottom. My knees cracked, and it always felt just "ok" so I have since scrapped.
Will still box squat and front squat, but prefer goblets, step ups, rdl, lunges, etc