Lots of games last season where Ronaldo gave worse performances than Rashford against Southampton infact the vast majority of the games Ronaldo played he produced far worse performances.
The geriatric goal machine isn't a goal machine anymore, he occansionaly rolls back the years and produces a vintage performance but they are now very few and far between, and when you demand evey Cross, through ball etc gets played to you even if other players are free and in better posistions then you will score a few goals but at a massive cost to the team.
We don't score that goal against Southampton with Ronaldo on the pitch, he wouldn't make the near post run Rashford did that dragged the defenders out of posistion and created the space for Bruno. With Ronaldo on the pitch, dalot would just chuck it towards him wherever he is in the box (probably around the penalty spot heavily marked) and then we rely on Ronaldo to produce something from nothing. Occansionaly he produces something brilliant and we score, buts its very much few a far between these days.
Ronaldo makes us very one dimensional and predictable going forward. And he drags down the team for the sake of his individual stats.