You know what I'm most happy about? I don't have to waste 2 extra slots keeping all 3 thunder spells in my bars...
And the best part? It's the same for a lot of those multi-tiered spells now too. Sure, it'll be an adjustment in possible dps output for some abilities, but that side of things will get sorted out as we go. (eg: Can't have Bio & Bio II at the same time anymore).
But thunder? all 3 spells applied the same damned effect - maybe they were different potencies, but they couldn't all be active at once, making it so 2 were basically pointless except for when level synced.