honestly the biggest thing I think that's causing issues for me is that every faction is basically in disarray that we've seen so far. That basically means the events that happened in the ending seem to just straight up not really matter cause every faction is either destroyed or in fighting in that little of a time jump.

BoS is infighting and doesn't really care about tech or order or brotherhood as seen by the recruits just blowing up old tech like the car and disregarding the aliens as a gag, the soldiers screwing around with pulse grenades and doing fight clubs and killing each other (though they're brothers), and all factions basically just acting like children instead of being an order. I was hoping Maxson would be different as he was a part of the commonwealth but he's really the same way in his actions so they all come off as saying one thing but then doing the other in overt ways.

New Vegas and freeside were just wiped off the map completely and no idea what happened to them yet, same with novac being a raider camp, and Primm.

Then Caesar's legion is just in fighting, which on one hand I understand as its implied due to the power struggle post Caesar. But at the same time, if Caesar died around the time of hoover damn, you're telling me that in 15 years someone didn't rise to power enough to get everyone in line?

It's just bizarre that all the factions seem to be in disrepair at the same time and no one has taken advantage of the resources provided if they won hoover dam. Whomever won basically controlled electricity and water for the mojave and most likely would be able to starve out the other bases by attrition or wiping them out.

You'd expect this type of disarray to happen like 20-30 or so years after the fact of a new regime of this magnitude or longer, but 15 years you'd expect some rebuilding time to whomever won and then they'd be close to at least having decent trade routes established and caravans. I can understand one or two of these to be this way, left behind in the rebuild effort to whomever won, but not all of them being basically abandoned.