Sorry mate, but depending on your age you don't know what it takes for your own team to be successful. Those I see defending him in the press or wherever, talk about the 'big moments', but to be successful teams need players who are more than that - City fans have lived success and know that.
Bellingham is a throwback to the Sven era of big name players who couldn't play together. He can't play with Phil, because over the last few years he's probably made about 5 passes to him. That isn't a team player, thats a player out for himself. The media generally love it because they are desperate for those kind of stars, so they've built him up to be something he isnt. Which is why so many are now pointing out his deficiencies.
I personally think his best role for England would be off the bench when needed, but unfortunately it doesn't seem like he has the personality to do that without potentially causing problems in a happy squad. It's a difficult one for Tuchel, but he's got time and any number of players could get injured, so he needs options still at this point.