I reckon such a feature would start catching on, even if it’s on client side.

The entire point of federation is to allow duplicate threads (kind of like how different forums can have the exact same discussion thread), but a consequence is it does spread activity out, and from my PoV, at least in the short term making things seem less active than they actually are is a bit discouraging for people to want to commit.

Cross-posting is also supported innately so that’s nice.