Yeah....I mean a coach can look at a player all game, look at his pass selection, look at his positioning, look at his decision making and think 'he's carrying out the plan as required' but a fan may be in the stands shouting 'get it fudging forward!!!!!'.
Ultimately we all see the same thing, but a coach and potentially ex pros do have a better understanding of the context in which those actions are taking place. That's why it's always funny to see people dismiss Poch continuing to play Sissoko or Deschamps picking him as something akin to a joke or something unexplained, because the truth of the matter is he probably is doing exactly what is needed. Deschamps described him as a good soldier. He's a coaches player, a team player, his decision making without the ball, his positioning, his tracking, his covering, his appreciation of space is probably actually pretty great, it's just he's needed to get more comfortable with the ball again. He'll never be an Eriksen but there is a way to get the best out of him in possession too and he's getting back there. I'm not surprised Poch trusts him too as a soldier and team player too, it's just funny that it would fly in the face of most fans who assume from his facial expressions that he's some sort of moody loner.
Coaches and more modern ex pros (e.g. Neville) can appreciate the context of things that we can't. It's why when Neville talks about the improvement in our players with England for example, in their mentality, how they prepare, how they perform, it means something. He knows what good looks like.