"Advanced Player's Complete Essential Options Unchained II, electric boogaloo!"
A million % agree. Like, I'm a little shocked that (was it Green Ronin)? The 3PP that put out SCAG didn't think along these lines... though I suppose WotC might have been micromanagers about it and said 'this book is specific to FR, any mention of other realms need to be 'in the margins' at best."
The artwork and armor design definitely did... I don't recall the Barbarian specific aspect being done in D&D prior - but it might have also been in the Complete Barbarian or Complete Dwarf or something. /shrugAs for Battlerager - honestly that was just a bad idea from the concept stage. (Did it even exist before?)