I coach an U18 team and you're correct somewhat. Here's the thing about your pragmatism. When we're trying to instill a style of play or a system for a team, the worst thing you can do as a coach, is during times of difficulties, ask your players to 'play another way'. Yes, sometimes we may ask certain players to take up different positions or even ask the team to adjust the formation a bit based on the opposition, but the overall process and the system must be the same. If you keep changing because of the opposition, the players would get confused and start distrusting the system you're trying to implement. Trust me on this one bro, I have experience on this one. Pragmatism is good but only to a point where your players aren't being confused and start questioning if you actually know what the hell you're doing.