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If anything, the healer's a much worse thing, because you can't really farm effectively w/o him at all, while you could farm stuff w/o a "mana manager" but just way slower.
Agreed, but the issue with this is, games that don't stick to EXTREMELY rigid trinity setups will often have backup healers, different mitigation options, or different target options. They do 'more things' still, just differently.
It's equally frustrating to be unable to find a healer if you just want to run 'basic content', but the game arguably can, by your choice, become MORE interesting if you can't find one (again, in a game where Trinity is not SUPER strongly enforced).
The thing about Mana restoration abilities is that unlike healing or DPS or even buffs, you can't just 'go around giving these to everyone' in the balance whiteboard the same way, so it is often very limited, and then, such is any other class when you can't find one.
There's also a subtler problem in SOME games.
Good Healers/Refreshers can be selective AND get boosted up quite fast exp wise. You don't 'get to keep them'. They log in some weekend with the goal of getting 10 levels in one day, and whoosh, they're gone. They want to play in a way that's suboptimal to your group? Tell them no, sure, then wait around for the next. Don't 'manage to prove yourself' to them even if you do keep up with them in exp? Can't be bothered with you.
There is a reason this is ALWAYS a problem.
Now apply this to 'mediocre Refreshers', because in most games, they don't have to be very good if the Refresh is strong enough and limited to them. The good ones REALLY aren't going to 'bother with you'.
This is my argument for 'Mana management good, focusing it on one Archetype bad'. Making a single class a COMMODITY for other people that they have to compete for is slightly different than 'Hey that DD was really good we should party with her again'.
EDIT: Clarification of contradiction, you can't give STRONG effective Mana Restoration to everyone, especially if it stacks, you create a very different game at that point and Trinity stuff breaks down altogether sometimes.