KidSnide
Adventurer
If every ower scales by tier, they can become signature powers for the character and that would make classes more distinct.
I'm not sure every power needs to scale by tier. I think there should be some powers (particularly the arcane and divine daily powers that tightly correspond to "spells" in the in-game fiction) that only exist at paragon or epic levels.
However, many or most powers should scale by tier. It would be nice if swapping powers was for fixing things that don't work and not a part of the standard advancement structure. I like the flexibility of replacing one power with a different power that works better. I don't like the idea that characters have to "forget" powers or risk falling behind in effectiveness.
It seems to me that 90% of encounter powers could scale by tier and the game would lose little other than dozens of pages of redundant material.
-KS