Jester David
Hero
The other spellcasting classes have the "spellcasting" class feature while the mage currently has "wizardry" with it's subclasses listed as "wizardry: illusion school". Most of the extensive study flavour (save one line) and all of the spellbook & casting via Int crunch is in the wizardry feature.Another major worry is that they are going to force certain classes under the Mage label despite that the class really may not fit. Classes like the Sorcerer, Warlock, Psion, and Artificer, are different from what a Mage is. The Sorcerer and Warlock does not obtain their magic from extensive study and the Psion may be considered to not have any magic at all. The Artificer's system is radically different with its access to lower level spells, but the ability to apply them to items.
Mage really seems to be the "magic user" class. It's the class that just casts spells (apart from the cleric and druid). So in theory all the variants just have shared mechanics.
And realistically, the big differences between wizards, sorcerers, warlocks, and psions is one of flavour and spell selection. The difference is the source of the spellcaster's power, which is almost a background.
This has a few benefits.
First, people won't be ale to multiclass sorcerer and wizards, which would be tricky to balance, and makes tracking spells awkward.
Second, it's easier to offer support. Feats and new spells can apply equally to the psion as the wizard, making it easier to offer new content. Likewise, if they need to make a new mage variant that subclass isn't starting from scratch.
Third, all classes can use the same iconic spells. Rather than having to hold back the telekinesis spell to make the psion different, or make its version different for the wizard's version, they can both use the same spell. And the pyrokinetic can gain access to fireball.
Fourth, by tying all the dedicated spellcasters together it makes it easier to reflavour magic in general without having to make room for three or four different classes. Customizing magic for your setting is easier.