Would be nice. Especially for tanks.

I heard somewhere it's because of traits. In the case of ninja for example putting kiss of the wasp on at 60 then entering totorak for example if it didn't reset when you entered you'd still have the 20% damage increase and not the 5% you should have at that level. Dunno how accurate that is. But with the way buffs tend to work based on stats when you apply them it sounds feasible at least

But yes it would be nice if they fixed it