Cristiano Ronaldo doesn't win titles on his own, if your team has a system built on making up for his flaws and highlighting his positives then Cristiano is great.

Flaws

Up until recently, those flaws were slightly skimmed through with easy comments such as "He's getting old" or Ralf Rangnick's favorite "He doesn't pressure". Of course, those were quickly replied to and shut down with "Age is just a number" and "Do you really need all 10 outfield players to pressure?"

It was never discussed in detail but Cristiano Ronaldo has a great scoring record and if someone is scoring goals then that automatically means they're the best.

I don't spend too much time on the pressure argument, but I will leave with this one point; Cristiano Ronaldo was among the 1% who pressured opponents the least in the Premier League last season among attackers.

Cristiano Ronaldo made 21% of Manchester United's shots last season. With Juventus, he made 28%. Perhaps, the best way to summarize this was done by @blanchy in his post

There are no teams in Europe wanting Ronaldo at this stage as he is a one man show but the team gets worse.

That sentence is a great summary of the issue, but stats are a great addition as they paint where the issue lies exactly.

Attacking Tactics

People who look at those shooting stats might also conclude that Cristiano Ronaldo is doing the most work offensively. However, that's not the case as teams usually have plans for how they attack, defend, and how to transition between both. It's football 101.

Without the pressure, Cristiano Ronaldo isn't doing the defense part. Attacking-wise, well, we'll see now.

Cristiano is a goal specialist, the best ever to have that role even if Pele adds another 400 goals to his tally. However, the manager usually sets up attacking methods and there are only so many shots you can take during a game, a player who shoots along 21% of the team's shots is problematic.

Another reason is Ronaldo isn't a team player. I am not saying he hates others or wants glory for himself. I am just saying that being the goal specialist he is, he wants to score goals mainly.

So, in many situations, the team is barely getting started to attack or maybe even aiming to keep the ball, and then you just have Cristiano jump in, shoot, it either goes in or not, most likely not, and then Manchester United have to go back to defense, which they will do without Cristiano helping much.

Does Cristiano Make Teams Better?

This segment is largely built on this article by Mark Carey in The Athletic. Ideally, I would say just go read that instead. But, here is my conclusion from the article:

There's a pattern of declining form by the teams in general after Cristiano Ronaldo joins them. Yes, Manchester United isn't exactly prime Barcelona and I stand behind saying that their finish in second place the season before was more reflecting the other teams, but, their form was a lot worse this season than the one before.

"Cristiano Is Still The Best Of A Declining Team"

It sounds like praise but once you look at everything mentioned above you'd realize how much Cristiano Ronaldo is causing that decline. You can't create a build pressure tactic with him, you can't create an attacking structure with him as a part of it as opposed to him being the main part of it.

Lack of ability to create an attacking structure with or without the ball. Hogging the ball, the high number of shooting, and finally, destroying the characters of players around according to the report of players who feel they can't grow with Cristiano in the team, young players specifically.

Another shocking thing from the article I mentioned is the fact that while Cristiano managed to score 18 goals in the league with Manchester United, the team as a whole scored 16 goals less in total. The same thing with Juventus, by the way.

It's Not All Cristiano's Fault

There's a certain level of charisma and/or weight that comes with the name of megastars. Leonardo Bonouci said it himself that players relied too much on Cristiano or they felt like they were already a goal up before the game started. Over-reliance is very lazy-like on the pitch. Similar things were said about Messi, Neymar at times, and even Mbappe nowadays.

In Conclusion

There are things that aren't Cristiano's fault as he is not responsible for others making less effort because he is there.

However, there are also things that are Cristiano's fault. There was a big drama last season just because Bruno Fernandes was taking the penalties even though Bruno does have a higher conversion rate and has been shooting penalties before Cristiano Showed up.

He squashes the characters of other players and the team in general as they only serve him. If they do, he'd score for them.

But that leaves very limited styles of play that mainly consist of receiving play and counterattack as the case is for Mourinho, Zidane, Ancellotti, or having others cover the extra yards for him as was the case under Sir Alex.

The best way to look at it is by remembering the criticism Pep received for not featuring Aguero that much and Klopp received for featuring Firmino too many times during the Brazilian's goal drought. You could disagree with one of them, but both can't be wrong for choosing a center-forward that serves the team as a whole even if it meant that the center-forward scored fewer goals.

Cristiano Ronaldo has become a luxury that clubs can't afford.