Utilizing the opportunity to gain sympathy and confidence is of course very good but it should also not be used as a reference and rule out some players who should be given playing time especially for them young players.
So that there is a balance where when he takes the confidence of the fans to see him as a worthy coach, this is also intended so that he can make young players comfortable because they get flying hours in a club because they are given the opportunity.
With the few games Kompany has played in the pre-season he's done that and that's a very good thing I think. There are some players who are given trust and get a good potential in the squad when the friendly matches can build their mentality to be even better so that pre-season although in terms of results we cannot expect much but it was quite successfully done by Kompany.
Of course there should be a room for other small players to also prove themselves, actually I understand the reason why you mentioned that because in most cases whenever a new coach is giving the opportunity they will tend to disallowed other smaller players from performing so that they will be able to continue wining all there matches and in most cases players doesn't like that kind of coaching pattern, however the good thing is that Kompany is not that kind of coach because during the time he was playing for Manchester City he knows that there are so much performance on young players if given the opportunity so he will always consider them, so perhaps already we can see it from there pre season matches because he did not only use the old players but also few of there younger players to see how they can perform.
No, I wouldn't say that most coaches would ban young players because this is one of the functions of friendly matches.
Apart from the coaches looking for new space to create schemes with some adjustments to be made in the work plan next season, coaches also know that they have to utilize the conditions of pre-season / friendly matches as an option to find the best seeds in their squad by providing good flight hours for young players especially by playing young players in matches like this will not interfere with the club's situation because this match is still a trial so surely all coaches will do the same because in addition to regeneration, this is also a form of developing young talent to benefit them later.