It is incredibly rare for that to happen to any youth player that is not in a lower division. For example, Sessegnon was the only one at the time who played for an older national youth side, and it was not Sancho. If you mean past the u18s, then Greenwood was called up to the u21 after finally playing for United (limited minutes) and after going on tour with United. Bellingham didn't even get that chance until he joined Dortmund. Same with Sancho.
The only way possible for Gomes to do that is to have gotten more minutes to prove himself at the time. However, that was under Mourinho, and not under Ole. Seems kind of unfair. Especially considering how United do loans.
I feel like at that point, what you think of as prodigious is different to how people view/discuss prodigious in a youth talent. Your view is more after the fact (benefit of hindsight), rather than a predictive quality (lumping very very few youth players as being prodigious, but that it does not guarantee future success). That's kind of like a Ravel and Pogba discussion. Like who could possibly tell Pogba would succeed, and Ravel not, based on talent? Or for example, being able to predict how Rashford would do?
I don't know why you've taken just one small part of my entire post (or indeed posts) to respond to, but youve completely missed my point.
I brought up England because the other guy did in comparison to James Garner.
I'm not even sure what you're on about with players playing up levels/ages. Any player that makes their full debut before turning 21 had played up, as has anyone who, for example, plays for the U19s while still eligible for the U18s (both of which Sancho did).
All of this was brought up to refute the claim that Gomes, at 17 years old, 5 and a half foot, and about 9 stone, was "clearly" too good for the U23s and ready for regular, senior football. He wasn't.
It may be rare for players to get called up an age group or to be given caps as teenagers (I haven't got the stats to see how frequently this occurs), but you can't bring that up as evidence of anything while completely ignoring that it's very rare for 17 year old to be getting regular starting spots in senior, professional football sides, and I'd wager even rarer for them to be given such a spot when they're not even contracted to that club.
This idea that United dropped the ball by not farming him out on loan at 17 or finding a spot for him in the first team is ludicrous.
The comment about prodigal talent was somewhat tongue in cheek, because it seems clear as day that Gomes wasn't actually ready for a starting spot at Manchester United, and at best was ready for a loan for just one season, before his contract ran out and he left. People are going on in here as if we let Messi go at 19.
Ultimately, I agree with the general point that United could handle young talent better. We have examples of players being kept for too long and we miss out on transfer fees (or larger fees if they were younger), we have examples of players being kept almost needlessly around the club instead of being loaned out, and we have examples of players being sent on bad loans. Gomes isn't an example of any of those, which has been my entire point.