Rockstar doesnt have a history of downgrading quality of games as far as I know. I have very high hopes that actual game would be even better than what we have been seeing or reading so far. And afterall since 2016 we have barely seen like 10 minutes of in game footage and hardly 25 to 30 screenshots.
Considering Rockstar being industry veterans and the kind of games like GTA V series they have under their belt. I am quite sure RDR2 will have more surprises that we have presumed so far.
Just to have an idea of it. I have played GTA V for quite a few hours ended it probably thrice but didnt notice atleast 20 of these details mentioned in the video below.