They rehash and recycle factions just so they don't have to come up with new ones, like Super Mutants and the Brotherhood, they usually have to come up with excuses for why their worlds aren't developed more even though things were already rebuilding by Fallout 1 and fully rebuilt in some areas in 2, and in general they treat it like an Elder Scrolls side project, not like a Fallout series.
What I mean by that last point is that Bethesda focuses far more on exploration and being able to shoot and loot your way through the game, while the OG devs focused far more on roleplaying and player choice, which you can see in 1, 2, and New Vegas as well.
If that's Cali, it should be far more developed unless the NCR canonically loses Hoover Dam, NCR territory had full universities and manufacturing, clean roads for vehicular travel, and the help of the Shi. That's what really worries me, if that's the East Coast Brotherhood meeting the NCR, I fear the BOS aren't going to get their shit kicked in when they logically should, considering the NCR beat the west coast BoS into submission as well.