Except that it's a completely different things because of Cataclysm and other zone changes. Nice try though.
I'm kinda in the same boat with OP. I love the world of Classic. I loved the world of Vanilla. But there were and still are some insanely stupid and tedious things in it that would be easy to fix by porting those QoL improvements from Retail. Personally I hope they will do this at some point. Classic+ would be much more interesting game than #100%nochanges.