Yeah, have no clue why people don't think they are just doing this. They literally did this with RDR 2. Like we aren't in the days of the 360 and PS3 where consoles were very weird architecturally. Things have been mostly smoothed out and porting while can be quite a task especially if you want to do it right (however Rockstar hasn't done great with doing it right) but its far more trivial compared to the past.