gw2 also has a static job system, so changing weapon isnt that big a deal. It also doesnt use TP. basically for a gear swap system to work they would have to build the game with that in mind, and in all honesty it would be better to seperate the traits from the gears and do it that way, so people arent blinking all over the place.

even with that though, making that type of system means there will be no minuses to gears like gear that slows you down etc.