We do all forms of leg locks at our gym except rolling ones + heel hooks, and yes it is odd to visit other gyms and see wide open toe holds and knee bars, totally undefended, even from higher belts - just because dudes just don't train it at those gyms.
What's more odd, is that at some of these "no leg locks" gyms, the way they rip away at sub attempts (as if every roll was the IBJJF World Championship Finals) - I actually find it a LOT more dangerous to roll there, than at my gym where we're constantly pulling off controlled leg locks.
It's all about the (let's not be asses and rip each others' limbs off) attitude, not the (type of) submission!