again should "you" do jump squats, probably no.
Are they bad, because you might have trouble, no.
At your US Ol training facility Tom Petranoff has his juniors doing depth jumps from the 11' roof of the equipment shed.
Should you (or I) do depth jumps from 11', probably not, without a lot of conditioning. Should they ???
Well if they are going to have knee problems at the end of sprinting 40m and then planting (decelerating over two paces - jav throwers) they may as well find out now.
and they don't have problems because they are conditioned for it.