User blog comment:Deshiba/Case study; Mana Regeneration./@comment-4091261-20140920180642/@comment-4022742-20140921090242

Extending the mana pool is a usual tactic, but it has one flaw; "Farming". For a lot of mages and caster types it is not uncommon to use skills to farm. When you have a large mana pool you can do it at a steady pace, but that is the thing. Pacing yourself is something that might be hard to do when pressured.

The same thing happens with extended fights, having a lot of mana is great, but sometimes when they survive long enough, you run out of juice. When that happens mana regeneration would have been better for you. I do believe in a healthy balance though, a good mana pool with a decent amount of regeneration would be beneficial. It's one of the reasons I dislike on  I tend to favor a  &  combination.

No other kind of resource can extend -or even shorten for rage/flow- their pool to reap the benefits without having to worry about waiting for their bar to fill up. Well, technically the health based champions can do this, Mana pool == Health pool & Mana regen == Health regen. The only difference was created when Mana Burn was removed from the game.