These kind of tackles commonly roll up players’ legs and ankles more than people think. It’s usually season ending injuries or automatic significant time missed. I can see why it’s banned. I saw it happen to Mark Andrews. It’s happens to RBs a lot. I think I remember seeing someone try to bring Olave down with a hip drop. A team’s best offensive skill player gets taken out the game when defenders become frustrated/lazy at tackling and resort to hip drops.
I understand the “how should they tackle” side. Defenders should also rely on actual sound tackling technique. Instead of pulling/twisting a player’s upper body and putting their weight on to ballcarriers’ lower body areas prone to injury. They’re very aware of what they’re doing. They get desperate to bring a player down in extreme ways when the ballcarrier’s gotten past them instead of actually tackling or grabbing the runner’s legs at that point.