That's a largely irrelevant point though. It doesn't matter if those early games aren't as optimised as games that will release later into the consoles life, all that matters is if they showcase visuals, tech, scope, assets, physics etc that are better than what we've seen previously, or in cross-gen releases, which is generally always the case with next-gen only exclusives and/or tent pole titles.
Hell, Ryse, Driveclub, Killzone Shadow Fall, Infamous Second Son, NBA 2K14 etc (all launch window titles) not only blew away the graphics and tech we'd seen prior to their subsequent releases, but they also still hold up even today, 7 years on. That's also the case for early next-gen only tentpole multiplatform titles like Battlefront and Assassin's Creed Unity.