In one of my kids recent teams he was specifically brought on because he played a sweeper-keeper style the coach wanted to build from the back. Coach really understood possession, worked from the position that the kids (all vying for MLS Next) could play possessional, practices were possessionally oriented with all goalkicks short, and shortly before the HS age switched to offensive and defensive tactical formulations. Problem was the top kids got upset at being MLS futures, MLS reserves or not-MLS rosters so went on to other opportunities including quite a few that got MLS core slots. The replacements couldn't handle the ball as well and the defenders were actually afraid of taking the ball (which was weird....none of the kids in my son's much lower Latino league team are afraid of having the ball...but I guess they were afraid of losing it and then getting yelled at). So it began to go that they would play possessional the first fifteen minutes, one of the defenders would lose the ball, it would go in for a short 1v1 against the GK and half the time they'd go down 1-0 and have to switch long. The problem with long, however, is you have to train that too...the midfielder should be able to chest or foot the ball down into possession but if that's not practiced then they won't be able to do that either. So eventually, the parents rebelled and forced the coach into a direct style system (which hasn't worked all that better for them) and it was also the end for my kid (since it's not the system he's learned and comfortable playing). And this is in a backup league to MLS Next where standings ultimately didn't matter....imagine the result in a pro/rel system where the team is in danger of getting relegated. The parents also had the gaul to turn on the coach and claim he didn't know what he was doing (that he was relying on a much more seasoned assistant who left).
One story illustrates: in one game my kid kicks the goalkick short to the left CB, who has room and begins to dribble up the field. The press comes but the LB is afraid of the ball so has closed himself off and is yelling at the left CB to go long. My kid has taken position to the side of the goal forming a triangle between the left CB and the DM in support. The left CB sees the press coming so kicks it back towards the center of the goal for an own goal. The left CB then proceeds to yell at my kid for not being in the goal "like he's supposed to".