They're not useless at all in TotM. A longbow inflicting slow in TotM means the enemy is going to have a tougher time closing in to melee with you. Pushing an enemy away in TotM may give an ally a chance to back away and not draw an opportunity attack it may have otherwise.
Serious question... do you play ToTM?
I do. And while I respect that different people play differently, I can tell you that they way we play it, it's useless.