It's a mind set. The PC self defense reflex taken to a weird extreme. One part Engineering geek, one part military ideology, all parts PC combat tweeking. And my local gamers all think like this to some degree. (Almost all of them.) I've tried to fight it before, but it's dug deep into the way I think these days.
These are the PC's who study a magic system and build characters that take advantage of the interesting ways it interacts with the world. They might start out as a Ranger, Adventurer, Researcher, Priest...but when it's all said in done they're equiped, cross trained, and deadly.
It starts out small with good ideas for the characters. Bags of holding, boots of speed, etc. Just logical items that would help the group on the go. But then they get curious and use the logic of the game world to 'invent' new tools and systems. Fantasy Flashlights, self-healing armor, alchemical med kits, etc. By the time it's done it's crazy, over the top stuff: floating self reloading flintlocks, portable housing that doubles as instant combat fortifications, foe seeking explosive packages, summonable auto-messengers.
And they teach each other useful skills. Specialization still happens, but they all have a 'default' level of skill and ability. A little knowledge skills points go a long way. And if everyone can learn some utility magic, the better. Standard Operation Procedure develop. Tactics rule the day and they Recon like crazy. Intel is their catch word. They ambush, steal, bribe, lockdown, hayduke, scramble communications. And all in the name of whatever NPC cause they support. I've had them radically alter the flow of games even when they wern't trying to 'break' the game. It's less about gaming the system and more about getting the most out of what characters can do. And they REALLY get into it.
I fight this style of play...but why fight it. What if I want to allow them to be The Fellowship of the Ring with the mentality of the A-Team. What sorts of fun things would you build into PC's to play up this form of militant magical powerhouse?