Sorry, we did no such thing v City or anyone else this season. What we did was produce outstanding long balls first from Dalot (recollection only...could be wrong on that) that found Garnacho after a catastrophic miscommunication between Gvardiol and Ortega (100% sure about that) for the open net goal by Garnacho and then long ball from Rashford to Garnacho (100% sure about that) that led to the pass Bruno who put in the assist of the season IMO to Mainoo for the manly finish. Bypassing City's midfield was the key to victory, not playing through it with short passing starting from Onana.
But your broader point is well taken, that Onana could be the beginning of something special. But on this occasion Onana's passing led to nothing special. Where Onana really stands apart from other keepers isn't his actual passing, but his first touch, which is fantastic even by the standards of an outfield player. He's no Pirlo, but for a keeper his first touch in like nothing I've ever seen from a keeper before. But his passing as such as acceptable, but nothing more than acceptable. Escaping danger from pressure with that first touch...wow.