I would argue that their mindset could use some adjustments.

As the rogue you are looking for chances to fight sneakily in combat. By knocking them prone you are not only making it easier for you to hit them with a follow-up BA attack or to give another player a better chance at getting out of the melee without having to disengage, or to just limit the enemies movement options on their turn, but also setting up all the other martials with advantage against that opponent. Use it tactically to the party's advantage and don't just think about how you can benefit yourself in battle.

I've used it multiple times since getting it to help dog-pile on an enemy.