Every single game, from every single developer gets a visual downgrade, from Uncharted 2 to Sunset Overdrive to this.
Some developers get caught out (Ubisoft), sometimes the differences are minimal (Uncharted 2) and other times people just dont care (Sunset Overdrive).
Wither 3 has clearly had a downgrade, from what I can see its just minimal cinematic stuff. No biggie.