People don't seem to truly appreciate the reason Ronaldo is actually poor for us and part of that has to do with the fact that United hadn't really evolved since Sir Alex left. A major pressing shift happened sometime around 2017, where every team started pressing more extensively, with Ole and Mourinho, we hardly really did this too much, so it wasn't as easy to spot.
It's not that he doesn't provide effort at times, the issue comes by way of his agility. Especially playing from the front, he doesn't have the balance and agility to make those lateral turns that create an avenue to block a path even when the ball can't be reached. As a striker, and more importantly as a lone striker, this task isn't the easiest, which is why a lot of forwards would rather play on the flanks these days. There is also the added lack of understanding from him in how to play as a no.9. Yes, he has been a fantastic forward, but as a 9, he also lacks awareness of when to press, come deep and at the moment he no longer has the quickness to attack the space as he used to.
As a result of all of this, our team loses the ability to pin the opposition back unless they are weak on the ball or choose to sit back; when Ronaldo is starting. Bruno tries so hard to cover for this. He sometimes switches places with Ronaldo, tries to cover heavily in behind as well and has been running himself to the ground to support him. Part of me thinks that this has also affected him in the attacking phase, as the amount of energy expended in patching things up makes him sloppier than he should be. In addition to this, it's also made him a bit less willing and able to provide the dual threat of being an active goalscorer, something which is another vibrant feature of his game. When people were looking for him to get dropped, it was obvious they weren't really watching what was going on. It's why Eriksen cannot play that role here either. Supporting Ronaldo requires a lot defensively for the no.10 and this would be even worse if we played a 433. Playing with Donny has pretty much exposed what that would look like for us. Donny is terrible and his work on the ball and invisibility far exceeds any disadvantage supporting Ronaldo gives us, but it does expose the fact that we can't continue to support him.
ETH may need to take an even harder line on the CR7 situation. It may require him to do more than just dropping him as his presence affects the team in so many ways. He doesn't even offer goals anymore. United need to supplement Martial. He's not reliable enough to be our main striker alone. At the very least we need to find him competition, not just for us to get goals, but for our team to function effectively.