Something I would have liked to have seen is Vidiians being assimilated by choice on the basis that being part of the Collective had to be better than suffering from the Phage. Instead of them just being enemies, they should have really leaned into how horrible it would be to live with that plague hanging over their heads. It’s also implied in an episode or two that there are uninfected populations somewhere, probably under quarantine, which would have been interesting to explore.
It’s always been both, just with our current problems offloaded to aliens for scrutinization. That they’re no longer using aliens for commentary is the problem.