Sorcerers and wizards have penalties using armour because they do not have the proficiency indeed, but they can multiclass, choose a race trained in armour (githyanki) or pick a feat (losing a stat upgrade) to be able to use armour.
The good thing is that you can cast your spells without any problem in medium or heavy armour and a shield, for example, if you have the proficiency.
No point in making armor-design-by-class like in PF:K but they could change armour by race, indeed.
Last edited by _Vic_; 19/06/20 01:53 PM.