My main takeaway is that Larian have killed the quintessential Wizard in robes.
Human and Half-Elf Wizards from now on will all wear Studded Leather and carry Shields. Because they all have military training.
What human and half-elf wizards? Why would anyone pick those instead of shield dwarfs with medium armor?
Because of two reasons I guess:
A. They want to play a human or half elf.
B. The game will greatly revolve around magic items. Your wizard can wear all the medium armors in the world, but probably those will have melee focused enchantments and to be a better wizard (if he cares about it, which is not necessary) he could use better the enchantments of a robe.