In the end what will happen is that if you lose a game, people who asked for another tactic will rant about it, like Oreo (if I remember well) did for the semi final ("I TOLD YOU TO PLAY MOTION"), dividing more and more the community interested by U21 team. In the long term, it is a bad mode of operation.
For roster selection you have also to keep as neutral as possible, so a few staff members is better for the same reason. I know that this selection is a very picky topic as managers which see their player not selected can be really unhappy. Lobbying can't be accepted.
Of course it is a duty to explain to the community your tactic choices with a game preview just before the game, discuss it on the chat if possible, analyse the game result afterwards etc. So you are open to community discussion obviously.
+1 as many times as i possibly can. While i am supporting a country-mate over you in the end, i think that this opinion is very valid despite an inaccuracy (Oreo did not contend that Motion was the right play, he contended that we should have run Man), and shows a more neutral opinion than most can provide about what happens on the u21 level. If you make the right decision, then people lobbying for different strategies or decisions tend to say very little about what they were clamoring for. When you are wrong, those times you were right are gone and you are left with having to listen to the garbage. It's not a USA problem alone even, it's an everywhere problem. Should've have run this, should have played him is the common argument every time something goes wrong. Doesn't mean we have dirty laundry to air, it's probably the same in france, spain, china, canada, brazil, latvia, germany, etc, etc.