You are partially correct. A2G high bar squats are safe and make a lot of sense for athletic purposes. If you can't reach there then it is likely you have some disfunction.
However, you should never try to go low bar A2G. This is inviting issues such as butt wink and other problems. Low bar is quite simply the easiest way to shift massive amounts of weight. It involves much more glute and ham, but this glute and ham tension should be maxing out for a rebound effect at parralel.
Source: competitive powerlifter with a solid high bar, front and low bar squat.