Well... I get the meaning--that's important.
I pretty much think that the armour system simplifies the way the game plays far too much. In addition, you have the skewed and quite limited character creation and progression. Any change to something more complex is welcomed, to be honest.
Like your idea--having a sort of Protoss shield on top of your regular armour? Why not? What about statuses, though? How are those gonna get applied?
But at this point-and I've said that before-they're better off just doing patches on OS2 and focus big time on the next big project. OS2 also has lore and story issues, where the game not only conflicts with other games from the Divinity franchise, the previous Original Sin game, but also leaves quite a few questions when observing it on its own.
Furthermore, the great multiplayer aspect, unfortunately, attracts far too many 'zmog, I liek big crits;I do dmg!' type of people...but that is more a product of the already mentioned issues.
Cheers...if you want to play online sometime, gimme a shout.