Strongly disagree with this.
Martínez, Malacia, Hojlund, Mount and Onana are good additions and profiles Ole's United sides lacked when he was manager. Mainoo and Garnacho have burst onto the scene under ETH. Amad and Dalot have improved massively and weren't ready to be key players just yet, back in 2021. There will also be at least 4 significant arrivals this summer, but I wouldn't be surprised if that number was 5 or 6 by September 1. So that's 5 players that weren't at the club yet, 2 youth players who have broken into the first team, and 2 players who weren't at their current level back then. 9 players. And then you add 4-6 new players this summer.
Which players left since Ole was sacked? Pogba, Mata, Cavani, Matic, Lingard, Bailly, Garner, Pereira, Chong, Henderson, Elanga, Fred, Telles, Kovar, Greenwood, Fernandez, Varane. The only player here who's a big loss is Greenwood, but that's not the club's fault. Pogba was a good player with insane talent, but it didn't work out and he wanted to leave. Varane was decent but nowhere near irreplaceable. And then there's Sancho whose fate remains unknown. The rest were either declining and/or intent on leaving, not good enough, weren't even getting significant minutes, or were too young to be playing first team football at that point.
Overall:
Martínez, Malacia, Hojlund, Onana, Mainoo, Garnacho, Dalot, Amad + 4-6 new arrivals
OR
Pogba, Mata, Cavani, Matic, Lingard, Bailly, Garner, Pereira, Chong, Henderson, Elanga, Fred, Telles, Kovar, Greenwood, Fernandez, Varane, Sancho (potentially).
Which group of players are you going with?