I really don’t like sliders either. As I said above, I think one of Civ VI’s strengths is how much it feels like a boardgame. Sliders are a complete anathema to that. Sorry.
That said, I do think there is a gap in the market for a “lowercase c” civilization game that is focused on being a more sim-like / skylines-like game than a boardgame. No builders, no settlers, maybe no units, no immortal rulers, probably still districts and improvements, and way more complex governance, diplomacy, tech etc. Hopefully still with a random map and still turn based (I can’t stand real-time). I think EUIV and a few other 4X are in that space, but don’t quite have the scope or historical perspective.