Having FGMPs as your side arm is problematic because those are area fire, radiation producing weapons. So soldiers equipped with them are not suitable for a wide range of deployment types. There needs to be a TL15 laser or gauss rifle with the fusion guns being the squad support or heavy weapons.
But, yeah, the whole idea of the Imperial Army being obsolete is silly. There absolutely should be a "provincial army" that might be TL12 or whatever is reasonable. But the Imperium itself should have mainline army units that are at the appropriate tech level.
But, yeah, the whole idea of the Imperial Army being obsolete is silly. There absolutely should be a "provincial army" that might be TL12 or whatever is reasonable. But the Imperium itself should have mainline army units that are at the appropriate tech level.