Ok, what should they do with Magic Users, Wizards, Mages, call them what you will in 5E? This is a pretty basic, and very divisive question.
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My "vision" of a 5E magic user is someone who has limited power but can bring it to bear with awesome effect. Who makes a big difference when they cast their spells, but can't do that to solve every problem. Who has to make tough decisions about when to use their power. Whose magic is flexible and useful for many different kinds of things, provided they have the right spell prepared. Yes, I prefer Vancian magic.
I think 3E got it wrong in the following ways:
Too many spells in one wizard's hands at higher levels.
Too many spells that did what other classes could do, without any drawbacks or inherent limitations.
Spells which fundamentally changed the game (Teleport) without appropriate costing/casting time/limitations to prevent their "spamming".
Too much buffing (more the cleric's domain, but wizards could be guilty of the multibuff too).
I hate the whole wizard carrying a crossbow thing. I don't mind vancian spellcasting, but there needs to be magic that the wizard can always do. For me if you rolled rituals back into their spell lists the 4e model isnt a bad model.
With occasional encounter and only a few daily powers, the "alternate concept of the past 3 years" remains fundamentally the same as what was described. At-will powers were practically weapon skills. There's no need to beat around the bush with trying to malign 4E though.Completely agree. That has been the concept of Wizard in D&D for more than 30 years, let's relegate the alternate concept of the past 3 years to a modular option, and we're fine. Keeping the current concept on the forefront will make it impossible to heal the fractured D&D gamers base.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.