New code base in a paid for expansion doesn't bode well for player, game, and support fragmentation, or would they drop the old era?
On the other hand, it very well might just be retroactive polishing up of things under the hood.
Cut the ties to the old generation of consoles. Until current players get the same graphics as alpha players did (just as an easy target, better is better) its still suboptimal that a downgrade occurred (and still does eg look at type 10). The only thing that would benefit from a downgrade is old consoles.