New cultures a dud?

[Final Cipher]

So I noticed in the patch notes that it was apparently meant to be possible for people doing certain legends to convert to ancient cultures, so I thought I'd try making custom rulers with those cultures to get a feel for them.
They all feel less fleshed-out than most mods would probably do for them.
I get that a lot of cultures, like Roman, are mostly there for historical purposes, but if there's meant to be some event that lets you turn your Scottish people Egyptian, should it not impact the game more than changing the names of new people to a mix of Greek and Arabic? After all the talk of London originally being 'New Troy', Trojan rulers wind up calling it London anyway.
Am I being unfair? I've just been going through the DLC's content for a while, and haven't really found anything that would radically change a new playthrough on the Legends side of things.