You're right, I'm sorry, this conversation is one that should have stopped earlier than it did, before feelings were hurt.
i think tech obtained buildings are supposed to be the core of how you acquire unity. Here's a list from the patch notes.
Symbol of Unity is for everybody now. And for everybody else, there looks like at least one or two should qualify based on ethos, depending on which of those is restricted.
Capitals also produce unity, I'm not sure if that applies to administrative centers as well.
I think the ethos specific civics are actually there to try to make certain, harder to play, ethos combinations more viable. Consider the most powerful civic I've seen so far,
Inwards Perfection
Monthly Unity +30%, Citizen Pop Happiness +5% Is some degree of Pacifist, Is some degree of Xenophobe
I'd rate this better than the +2 core systems, slaver guilds or mining guilds. In fact, this one is powerful enough that I think it makes xenophobe/pacifist competitive and will easily define how people expect to play that combination in the future.
Which is good because without it, picking a pacifistic xenophobe was easily handicapping yourself with probably the worst ethos combination.