The Human Target
Adventurer
If he wants? Level 7 encounter powers are just better than level 3. Of course he wants to swap them if allowed to. He also wants to qualify for feats without needing the required attributes and would love unlimited Healing Surge.
A certain song comes to mind.
In some cases they are.
Most of the classes have a lot of powers in each tier that could pretty much be interchangeable in power level IMO.
And also I guess my point is if you can trade things out fairly often at higher levels why not let character have the same setup at heroic?