I'm not sure I understand your first paragraph. Being heavily involved is a positive thing as a 20 year old, not a negative. You have pointed it out yourself previously regarding strikers; you don't necessarily care for strikers missing big chances, but that they're getting into these shooting positions in the first place is what counts. If all you see is Dorgu wasting opportunities, you need to pay more attention. Last night, he made a pass that should have been an assist. The match before against Athletic, he made a cross that somehow didn't end up back in the net (that somehow is Hojlund), and we have seen several other big opportunities. Yeah, he has absolutely obliterated a lot of opportunities, but the fact that he is already so involved is not to be made out to be a bad thing. It is quite promising.
Of course everyone would rather have Hakimi, or Nuno Mendes. But those players aren't just around waiting to be picked up by us. They are two of the best backs in the world. For the sake of the debate, let's use Mazraoui as an example. He is much more technically gifted than Dorgu, but what does he really offer offensively? I know he has been playing CB a lot, but the times he has played RB or RWB, why isn't he as heavily involved as Dorgu? I mean, he is excellent with the ball at his feet, able to take on players and dribble, press resistant and a very good passer, so why isn't he contributing more or finding himself in the same positions as Dorgu? Surely, if it was as easy as you're saying, then he would be doing it.
You can call Dumfries flavour of the week, or whatever you want to call him, but the fact is that he is one of the most effective wingbacks in the world and has been for some time. Not as flashy, or aesthetically pleasing to watch, but he - like Dorgu - is heavily involved in their attacking play and is a huge reason along with Dimarco to why they can play the way they do. We don't need Dorgu to be an elite technician, we need him to be effective under Amorim. We have played with left backs that have been very good technically before in Alex Telles and Sergio Reguilon. Neither of them worked out here, so it is far from a guarantee that signing any LWB with great technical qualities would work out.
Mendes: You would hope so given that he is the world's best LWB.
Malo Gusto: I think you should look up what Chelsea fans think of him.
Livramento: Player with some of the worst attacking contributions among all fullbacks.
Rico Lewis: City fans are literally calling him a joke and the worst fullback they have ever had.
It's really easy to say every other club has better wingbacks because you don't watch them as much, and you don't get irritated as often for mistakes. Replace them with Dorgu in our team, watch them every match for 90 minutes and you'd be just as mad.
All your examples other than Rico Lewis are one or two years older than Dorgu, making them further in their development, so you're not really answering his question. Can you list 20 year old LWBs that were equally as rated as him? I'm not saying he has world class potential, but the guy was being scouted and looked at by us, Spurs, Napoli, Barcelona, Juventus and Liverpool. I don't think they would be sending scouts to watch him on several occasions if he was a talentless player with no qualities. You also have Amorim who specifically wanted him after Mendes signing a new contract with PSG. Amorim rebuilt Sporting from a disaster to champions of Portugal and a powerhouse who dominated City in the CL. He knows exactly what he wants from his players, and he sees qualities in players that he can work with. You probably didn't know half of the players in Sporting when they toyed with City, but it is not necessarily about individual quality, but the power of a system where players perform their job down to a tee, and he believes Dorgu can do that role as our LWB. Tactically, so far, he seems to have a good grasp on what his role is. Now it's down to working hard to improve further, learn his team mates better, adapt to the pace of the league and have a winning mentality.