Why should I waste time playing with reserves and just being glad training with first team while seeing players much worse than me getting to play more minutes while I can move to other clubs, play more, improve myself more and become a much better player faster than just training with reserves. In case of Pogba why he would stay in a club he's barely playing in and seeing United going with Park and Rafael in midfield ahead of him (and losing the match too) with key injuries around when he can move to another big club like Juve and play all the time ? No brainer really. Again if you ask him now about this decision what do you expect ? That he'll say he regrets it and should have stayed and waited for his chance ? His answer would be obvious.
Maybe Lingard waited all this because he's not even as half talented as Gomes or Pogba who knew they're much better than playing for reserves and seeing trash players playing ahead of them. Some players are more ambitious and know their value. Some are just content to stick around and glad to be in such level even if they don't play a minute. Ambition is a key, and I know which profile of player I prefer.
Ultimately it's the right move for his career. He'll be 20 by August. No more time for such a talented player to waste in reserves. Time to move on and seek to develop his talent in a club willing to give him time for that. We didn't play him enough when injuries were left, right and center, we didn't send him in a loan. We just wanted to keep him around even without playing a minute to be just an "option" for when we decide it's the right time to play him. Of course no talented player who really believes in himself will accept such thing. Try to think from the player's perspective, not the club's one.
Yes we'll have to move on but we managed everything about him poorly and again for God sake, I hope we don't come 3-4 years later and bring posts from this thread and laugh at it and regret not managing this situation better. I hope this doesn't happen, because it'll reflect poorly on the club.
I don't disagree with your belief in wanting players who are hungry and are ambitious. But when you're that young, that small, that weak, but have potential, it's going to take time. I think United know how to develop players by now. If I come up through the ranks at United, and I really wanted to play for them and they wanted me, I'd sign with them knowing that time is still on my side.
Pogba's situation is nowhere near Gomes's situation because of player talent and player mental/physical/emotional status. Again, Pogba was the exception and not the rule.
All players know their value, especially when they are part of a first team squad and first XI. Gomes has always been on the fringes of being a first team squad player.
As a player of that age and that stature, I'd have more patience if I really wanted to play for United. They believed in me through my teenage years and still believe in me by offering me a contract that bridges me from teenage years into early 20s as a professional.
I don't think Gomes has been treated any differently compared to Garner, Greenwood, McTominay, Henderson, and the other youth players who have resigned a contract going into this season or during the season. They've been given a path towards the first team and believed in the process set by the club. Gomes doesn't believe it in anymore. If he does himself good in a career after United, that's great on his part, happy for him. But only time will tell and really it's now up to Gomes to see how far his talent and self-belief carries him. I hope he goes to a club that is a good fit for him in terms of his talents and not just because of the immediate money he could make. We'll see an "Angel Gomes - 20/21 Performances" thread I'm sure, and then we'll be able to continue to judge him.
Either way, if I'm the player I have a lot to prove and improve on myself as a professional regardless of what club I'm playing for. The economics and politics of this can always get sloppy and be far from the truth.