A few studies have shown that the parallel squat is king for maximizing work and overloading on the muscles . High reps with low to moderate weight gives exercisers the least effective way to overload the lower body muscles. The deep squat can contribute to tight knee joints / kneecap pressure . With this in mind , would you put deep squats in your personal leg workout ?
If properly progressed to, maybe. Progressions? Did that many of the people getting certified skip the part on progressions/regressions? Never have a client attempt an exercise that they haven’t demonstrate competence in performing the exercise at the progression level below that exercise level. EVER!