I have no problem with that. I think he's done well too. But within reason. He has developed into a decent RB, but by no means a particularly good one.
Darmian, considered as a starter for United, made a lot of sense when he was signed. I don't think all that sense has vanished. Like I said above, when he was signed, he was a star of sorts. And there was a reason for that - it wasn't all LVG and his idiosyncratic plots.
People on here tend to deal in extremes. A bad season amounts to a player being utterly useless - for ever. I think Darmian has shown enough promise to warrant some faith in him - but it obviously comes down to systems and managers as well as abilities. If Mourinho doesn't want him - fair enough, he's hardly the biggest piece in the puzzle.
My point - if any - is that some people are now talking as though we have an undeniable top class RB in the shape of Valencia, so the very idea of Darmian, or anyone else, is a bit...redundant. I don't agree with that - as I don't think Valencia is a top class RB. And he certainly won't develop into one at this stage.