It's true that breaking rooms with charm is an example of where it's nice to have a big mana pool, but even a HP stacked Necro should be fine it those situations, because you aren't factoring in the med time you get while killing. Also, having the VP clicky changes the calculus entirely. If you're able to spam that thing whenever then it's no wonder you're devaluing the importance of HP. I've never used one but I can't imagine that the mana free lifetap is anything less than a total game changer.
I mean the argument essentially boils down to the fact that running out of mana is bad, but running out of hitpoints is worse. And it's much easier to anticipate going OOM than it is to anticipate a drop in hitpoints, and smart play can make up for a lower mana pool on a Necro (since you can regen mana so quickly) easier than you can make up for low hp (since you tend to lose hp quickly when things go badly which are often beyond your control, like getting resists or charm breaks).
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