NCR was poorly armed and they won against BoS. Now please explain to me how they can and the Legion can't. And please say something more intelligent then "they wear skirts."
Well for one they are more experienced with fighting the BoS, they have proper weapons and they actually have a 'reason' to go after the BoS hell for leather, IMO the legion would be far FAR too late.
Or are we just assuming that the BoS would get the weapon working and then sit on their hands. No secondary defences, patrols etc.
I mean it's only elijah in command, the guy who in one of the endings conquers the dam world.. :S
This bias thing is rubbish, apparently its only the legion who can use tactics and 'think outside of the box'?
So between House's securitrons around the strip, the desert rangers everywhere and the BoS at Helios, yes, I feel quietly confident that the Legion would indeed just find another way around.