With the risk that you think I’m a little offensive… Noone forces you to use 102 Mana cost spells. My caster makes use of teleport for nuke spells because 0 Manacost is pretty nice even for a 60 cost spell.
Sure it sounds like very little to have only 20 manareg with a 100% increase but you forgett Mana efficency totaly in your calculation. 10% mana efficency would bring the mentioned orb to 90 manacost and 10% mana efficency is easiely obtainable.
I REALY like the fact that there is no mindless psamming because manareg will solve this issue even why I love the volcanic orb spell dearly I’m still happy. I still think the issue is somewhere else because the full dmg built volcanic orb with gear it benefits from is still nothing compared to the dmg other classes can deal with the same ammount of mana.
So I’m pretty happy with focus and the teleport option to counteract immense mana drains.
A middle ground may be 5 mana reg from the beginning with 0.5 more mana reg untill you hit 15 natural mana reg, so you could easyly achive 30 mana reg. This might help with issues some people have for whatever reason without being to good to soley take care of mana issues. 30 manareg on the other hand would make me laugh on almost every other class that isn’t using caster nukes.
I still ask myself if there is any more gear coming that helps casters like a helm with mana efficency or something alike. Without knowing what’s there to come I realy won’t touch manareg at all even if some skillbuilds suffer from it.