Ah yes, because when you're in war people will always be so polite as to never use long range tactics.
This is how you get your country conquered. I get that culture can lead to effective tactics like this being viewed down on, and I also get how people would be frustrated when dealing with someone like that, after all when you don't feel like you can take effective action you're going to get frustrated, but it's not like this guy developed the concept of a 'wand', how is it that this guy who clearly would be excellent to be on your team in the battlefield is seem as if he's a burden? If everyone is this backwards minded about how battle works, why aren't there rules to prevent these sorts of tactics from succeeding? How come no one else uses this standard weapon option for golems? The MC has lost battles before even after developing his shoot and run tactics, why hasn't that come into question except when talking with the guy who has specifically beaten him before.
I understand the feeling that the author is going for here, but the longer they drag it out the more it will become a problem. When we were limited just to the school and training area, but having the judges be the ones to determine that MC won, I figured it was mostly just newbies who haven't been on the battlefield frustrated that they couldn't do anything, while the level headed judges knew the importance of people to fill rolls like the MC, but now we've got everyone, even the judges, conspiring against him and even trying to develop counters to his strategy that involve 2 shields (a bit questionable tactic for actual war since you'd be unable to hurt your enemies and you probably wouldn't be able to defend most of your allies, a shield wall would be a more effective defense with minimal offensive sacrifice) but we've yet to see anyone who brings a 'wand' to use against this guy.