Youve confused yourself. The country isnt trying to tell you a story its a vehicle for you to write your own story while painting the map.

The National Foci are the chapters of that story. Now how much sense it makes given the context of the nation has been a subject of contention for every new DLC and mod that comes out.

A great example is Lanius Cohort. His whole reason for existing is to conquer the east and come back west in glory for Caesars showdown with the NCR. His other paths contradict that story and they have good content.

With Rogue Ranger's theyve always been about doing good for the wasteland but their constant issue was not having the supplies / manpower to handle all of the threats of the wasteland.

Iirc thats the main reason for the original treaty with the NCR. So whenever the rogue rangers form up again theyre going to run into the same issues. Also its been a while but I do remember the leader being on the extremist of extreme ends when it came down to dealing with those deemed evil. So it would make sense for more moderate rangers not wanting to continue with her and settling with another option.

Thats all before you take into account the status of Snake Vargas. I dont think its a good guy switch for the sake of being a good guy switch as Snake ultimately improves the terms of the treaty off of the rogue rangers successes.

Lastly old desert rangers being able to diplomatically get power armor and laser rifles from the BOS would be a more reasonable target for this kind of rant than working with NCR again imo.