Modern football requires a goalkeeper who can build attacks from the ground with his accurate passing. But what happened to Machester United is that they neglected the things that a goalkeeper should have, namely good reflexes and also a good reading of the direction of the ball, and that is now not shown by Onana.
I would largely agree and say the same thing about Manchester United, which is that they have made a mistake in discarding David de Gea, although his weakness is not having good passing, in my opinion it is a weakness that can be corrected.
The present age football, we have witnessed enough actions, much pressure will be exerted on a player if he's not performing brilliant as a player. I've watch David de Gea in Manchester United Jersey for years, he do have his good and bad effects which serves as weaknesses., but André Onana weakness seems to be the worst. David de Gea was complete as consistent goalkeeper for Manchester United but what he lacks was not having the accuracy of good passing to his teammates which we all that it can be corrected with enough practiced on the training ground.