The different layers of clothing and armor worked in MW because a lot of them had limited enchantment value. Pauldrons in particular weren't very enchantable. In OB, there were no limits on each individual item, so they cut down the total number of pieces to reduce the ability to stack enchantments.
In other words, they "broke" Enchanting between MW and OB, so in order to "fix" the symptom they broke the armor/clothing system as well.
Other way around, they cut armor slots to make better looking armor and clothing.
Then they removed cast on use enchants because it was to easy to exploit, together with some constant effect enchants like restore health for the same reason.
Then they removed max enchanted values for items and let the soulgem decide the strength. This let everything have the same enchant value so you can wear any clothes you want as a mage
Other way around, they cut armor slots to make better looking armor and clothing.
Then they removed cast on use enchants because it was to easy to exploit, together with some constant effect enchants like restore health for the same reason.
So yes if we get twice as many equipment slots maximum constant effect enchant will be lower.