We do have ethic specific Agenda - but they're tied to the governing ethos.
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It might be good to say these 8 agenda are valid if you have that governing ethos OR your ruler has that ethos (so if im fan auth and spir, but my ruler is materialist - i can still run a materialist-keyed agenda).
Also i think it would be good if we could have a "Ruler favours [Agenda]" - and the game randomly picks 1-3 from your valid pool. Running that empowered agenda makes it take 50% less time/cost less to rush and increases the statistical effect by 50% when it's active at full power.
I don't think this is going to make it less of a boring mechanic - nor would upping the number of ethos-locked agendas IMO - but the option to pick empowered agendas would make it slightly more engaging in elections when choosing who gets the top position, without things becoming locked off - normally I'd be for locking off things for choice, but given how powerful ruler/council traits can get, I can imagine forgoing agendas just to not deal with the hassle of juggling my council and watching a random planet go bankrupt lol.
That said, I stand by what I said in
another thread yday about agendas, for them to be improved, we need small story events to tie them to factions, council-leaders directly (as characters) and "empires of interest" (neighbours, rivals, your overlord etc). A bit like some of the events in the new origin - but more generally, for all empires, and more wide-reaching.