Exactly. Powers are NOT balanced solely on level acquired (in fact, they barely are at all in that sense) but on where you get them from. Your epic power pools do not have those worse stats because of when you got them; they have worse stats because they aren't your primary or secondary role. Multipliers affecting damage, endurance cost, recharge, defense, resistance, etc should be best for primaries, then secondaries, then epics, then power pools, then inherents by design. It may seem to make some powers worthless, but power pool attacks just barely edging out brawl is absolutely consistent with the game design going back 15+ years.
That said, there is a very obvious preference towards certain pools throughout the history of this game, so the least popular pools (medicine, presence, teleport) should probably get thrown a bone if devs are going to spend time on power pools right now.