What was the budget and time investment given to RDR2 or even GTAV?
Its not an apples to apples comparison.
Which I always find odd, people constantly saying how come RDR2 could do this in year z why doesnt game x also do this.
The time, money, personnel and technical prowess to do an RDR2 isnt in every dev studios budget (time/tech/monetary).
Thats your answer, not that its impossible to replicate but who is gonna invest in waiting 10 years between Assassins Creed games noting that the monolith that is Ubi has studios who support their own engines so they cant exactly look at what Snowdrop does and just port it for Anvil.
All Rockstar studios use RAGE, they were all pulled in to work on the project and RDR2 had crunch of like 55 hour weeks.
Rockstar the giant with basically a blank check and borderline limitless support still took 8 years to make RDR2.
Do you really want to be waiting 10 years between sequels of games?
RDR and GTA games are unicorn games, its allowed but unfair to hold all games to the same standard.