This is not MY OWN OPINION. This is an objective opinion brought on by facts.
Haha, oh wow. Okay important lesson: An "objective opinion" is a paradox, i.e. such a thing can not exist.
You've stated your opinion on what's best for the balancing of this game, and you have used arguments to convince us of that opinion. Me and some other people have disagreed though - not necessarily by saying that your arguments are incorrect, but that there are other points of view in which your arguments are not as important as they are in your point of view.
Furthermore, I have given you a system that is essentially equal in terms of balancing to the solution your perceive as the perfect one. With the benefit that it improves other aspects of the experience. You say that a partially regenerating mana bar is better than a fully regenerating one. I say, let's just remove the part that does not regenerate and give the player some mana potions at the beginning of a mission to balance this newly introduced handicap of less mana at the beginning.
And that's just one example (and like I said, surely not the perfect one) how you could counteract the psychological fact that for some people, a mana bar that only partially regenerates feels unsatisfying.
You could argue that it has flaws of its own, but that's just the point: Every system has flaws depending on your point of view.
So basically, don't tell people what opinion they should have. It's not cool and you're wrong when you do it.
@GepardenK: My argument was aimed at strifecross, so it doesn't work for your point of view. I actually agree with you that a bar that does not regenerate at all is better than one that does (partially or fully). But it's just opinions, and many people don't agree with us on that one.