Miles better in what? Locatelli is better than all our mids but Arthur? He's a mediocre version of Thiago or Verratti. That's still only one mid that is good, and we need him Infront of defense rather than between the lines. Again, Ronaldo is a big difference both in quality and how we play. He pushes others and his presence is immense. So immense that once he's gone, the others struggle because they are so used on depending on him. If he stayed, we'd see a different picture on the table and we wouldn't even have this discussion.
Agree about Rabiot on the left (last night it was a 352 though) but I say stop playing him all together. Or as rarely as possible. He's a entitled fuck who doesn't deserve 10% of the salary he's being paid. Play 3 mids, yes, but Loca-Bent and one of Arthur or McK. Then have Chiesa, Dybala, Kulu/Berna/Cuads in front. Bench Morata until he gets his shit together. In theory that's great but let's see what Max comes up with next game. Experimentation phase should be over, he should have an idea by now