I don't think stat requirements are entirely necessary; most item types already favor a certain "class-type" through the bonuses they give, which seem to be restricted by the item type. We just don't get to see much of this as of yet because of how early access is restricted to low-level play.
For example, heavier armor tends to give bonuses to stats like Warfare and Strength, which incentivizes the classic Warrior-types to wear it over mages.
Likewise, staves tend to grant INT bonuses and not STR, while bows and crossbows grant Finesse and Marksmanship, etc. Then you have utility slot items like necklaces and rings which can either improve specialized builds further or help hybrid builds round out their secondary attributes.
