Yeah, rarity doesn’t stop the “special reward” from being a terrible idea. If there’s a however small chance of getting extra orbs or gems from using an otherwise inefficient troop, it becomes the optimal play and removes variety from the game. Suddenly, if you don’t have or aren’t using new troop, you lose out on access to significant resources that others have access to. If you are using an otherwise unexciting troop for a tiny chance of rewards, you’ve got a boring experience in Gems of Farming.
I’m not talking out of my ass, either. Back in the day, Valk was the only troop that generated souls during fights. Sure, she was pretty useful anyways, but it came to the point where the optimal progression strategy was to find Valk, and make a team of 3+her, or otherwise you wouldn’t have enough souls to level anything. 200+ troops at the time, but every team worth using had to have Valk or you were missing out on souls.
Let’s not go back to that.