No idea if this has been brought up at all but something I found very distracting is the culture border/name colors not matching the flags at all. Gets very confusing when somebody elses flags match my culture borders very closely

I havent played enough of this yet to see all the civs (somehow both of my random starts made me Sshrathi, with a different leader each time, and I've seen the 'ancients' in both games too) but of the ones I have seen:
Orcs need a yellow or golden color. The current Sshrathi color matches their flag pretty much perfectly.
The Sshrathi should have a red (or a black, but I am not sure if there is any black besides barbarian black available). The current Orc color would match pretty decently.
Centaurs would do well with a royal blue or perhaps white. Like the French in regular c4.
the tigrans already match well. I haven't noticed any problem with the ancients but I havent' seen a lot of their units (and never when I was paying attention!)
There's another problem with the ancients which I don't know if it can be easily or conveniently addressed (unless you just happen to have a replacement term in mind.) or if it is even worth it. But when she offered me a deal, she said, "Can
Ancient tempt you..." which is not good grammar.