The NCR has way more problems than the taxation, which a lot of NPCs complain (hey, like IRL conservatives). Chief Hanlon's conversation implies that the NCR is exhausting its natural resources from overuse, draining water from lakes etc. in the service of agrarian capital, with the profit motive being the driving force behind capitalist development there - at least according to a followers' critique and they sustain themselves through imperialism - which is why Chief Hanlon wants the NCR to take an L in the Mojave, to discourage the country from overextension. Thomas Hildern of the OSI (who is willing to use dangerous technology and steal credits from the people working under him) implies that the NCR is heading towards famine from low soil fertility (the reason for the Vault 22 side quest). It could be interpreted (and probably was intended) as a malthusian critique, but the metabolic rift inherent to capitalist agricultural production is also playing a huge role in it.

To read orientalism from the Legion is a bit of a stretch. Even chuds are very very unlikely to use the metaphor of Ancient Rome as the evil orient or as communist, ergo this take is rare to see even somewhere like r/newvegasmemes.

There's a case to be made that the Arcade companion quest is apologetic towards the Enclave troopers, yes. The only one among them who opposes just outright siding with the Legion in the battle is Arcade himself.

The House ending explicitly does NOT leave these communities alone. If the Kings aren't incited to fight against the NCR, he'll send the securitrons to kill them. If the NCR takes over Primm, he imposes a special heavy tax on the town just for the hell of it. For all his pretenses of being an enlightened impartial benevolent dictator, he's sure petty like Elon Musk.

Overall, the devs do have a bias. Somewhere between a libertarian and a socdem one, I think.