I'm really wondering what John expected more of to be honest. Throughout the video he mentions how it doesn't go as far as he thought it would, but really what else could they have done? It looks like nearly everything was updated (some parts better than others sure), and then put into XC2's engine. Improved models, improved textures, shadow maps, more foliage, motion blur, SSR, etc. What else could there be done to it? I guess maybe go further into remake territory, but that isn't what this is.
Saying that, I found XC2 hard to play on my 4K TV and distracting in portable mode. I really wanted to ignore the resolution but found it really difficult. I really kind of wish they could have sacrificed some graphical effects and gone for something more simple in order to get a much cleaner result, rather than try to push for more modern techniques that the Switch struggles with in this engine. But it is good to see that the resolution might hit the higher boundaries more often than XC2 and that the sharpening has been toned down; that will help a great deal.
I've never actually played this one so I am tempted to pick it up some time.