Does Squat Depth Matter? Many are adamant that deep squats are a requisite, while others thing half squats are more than enough. What does the evidence actually say on this topic?
A 2013 study from Bloomquist et al. compared a load equated shallow squat vs a deep squat for effects on hypertrophy and performance. The deep squat group improved 1RM in both lifts (the shallow only increased their shallow squat), a greater increase for their isometric knee extension strength, a higher improvement in jump performance, and the deep squat also showed a superior increase in quadriceps cross sectional area. .
A recent review from Newmire & Darryn on muscle hypertrophy and range of motion expands that there is likely a specific range of motion for different muscle groups that elicits their maximal stimulus, therefore using a full range of motion encourages stimulating an even distribution across the board.