I was always under the impression that charisma was hard to max, but perhaps that might be kunark?
Either way i threw all the points i could into stam when making my necro, never regretted it and nor will i ever
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Something to keep in mind is that there are classes with exceptions. Shammies, particular soloing dragons for insane lewtz shammies, will never need more than 180 wis at endgame velious. Your cannibalize and torpor will couple for more than enough mana regen, and there's been countless threads discussing this (or at least that i remember reading on the old forums), stating that a point in stamina or +hp gear is more beneficial than a single point in wis.
Though with that said, you may still be better off throwing your points into wis at the start, not because you NEED 200 wis as a shaman in classic, but because you're allowed to focus on actual +hp/stam items rather than getting low AC/wis items in the expansions down the line.