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 ?
For the majority of people- simple leg press or parallel squats will be more than adequate.
For the minority who want to play sports or really challenge themselves? Deep squats are a must.
Ignore those who say the deep squats are bad for the knees- completely not true as long as the person progresses safely and at a good pace. Most injuries are results from people training improperly.