I've been playing around with suggestions here and am suddenly a MUCH stronger player.
It doesn't have much cost to drop settlers on lux resources for trades. As long as you don't trade yourself into bad
, which you probably won't if you go coli first in each new city, the lux resource ROI is absolutely incredible even if you DON'T BS the AI via self-pillaged tiles every 3 turns (I avoid doing this expecting it to be patched).
You can build military units/gold in one city, science buildings in another, and everything else is just stock small cities that are really more like resource outposts that eventually generate wealth (significantly more than they cost) - the ability to spam bankrolling RAs just completely overwhelms everything else in the game right now. Even with like 200 bpt I dug into the modern era around 1600 AD or so and was throwing around mechinf and air not long after. I don't micro optimize because I'm lazy, good players on larger maps (this one was tiny; only 3 RAs at once available) could get MUCH deeper into the tree sooner due to more RA. They're just that good, whether or not you "steer" them.
So right now, this game is EXTREMELY resource driven, with a little bit of requirements in tactics and macro specialization (a big science capitol to clear more minor techs is a nice plus).