I would expect there to be tensions between Koeman and Reed. That is part of the job.
One thing about Pochettino was that he was always very good about getting young players into the side. I'm not just talking about Chambers or Shaw who arguably were natural talents. He would regularly substitute young players in at the end of games, even if the score were close.
That said, JWP is not playing on merit. It's not like that is a particularly strong position for us. He got a good run of starts in last season and to me just wasn't good enough. And he would still have gotten plenty of playing time had we not crashed out of Europa.
Targett is playing. You can argue that it's only because Bertrand is injured. But on the other hand, it's expected that Bertrand would be injured at times or need a break. So there was enough playing time and opportunity for him. We could have gotten another LB, but we didn't because of Targett. Now I think some are wishing we had.
And beyond all that, I don't necessarily have a problem with players going out on loan. If done right, those players get a chance to play every game, instead of maybe every third game. MP thought it was better to train with the team, and that might be fine for his system. But it's not the only way. I thought the Turnbull loan was very successful last year. He is still only 20. I mean, how many of us right now would be comfortable with Turnbull starting games? I would argue that Lallana and Schneiderlin got as good as they were precisely because they played everyday and went through the trenches at the lower levels rather than sporadic PL appearances.
The only guy I would really question Koeman about is Reed. Not saying he should start, but he is a guy that Koeman could find more playing time for, and IMO has not.
But this is why going out at Europa is so annoying. If we'd made it to the group stage there would have been plenty of game time for JWP, Targett, Reed and some others. Some will disagree, but I would have been just fine with us going all out to advance but getting 3-4 extra games for those players. Between that and the domestic cups, there would have been plenty of playing time. Now there isn't.