Agree with you on the above with the fact that city building is a little better than colony building. They even made things worse as far as colony building in three by over all lowering the average class of planets. I asked for something like civilization where you just build all the buildings instead, so you never run out. That would also solve any problem dealing with to much science, or manufacturing. This would either change the usage of classes on planets, or eliminate them. There are other aspects of the game that causes to rival civilization. I also, said I didn't like five. I'd enjoyed four a lot; because, of the features that made the game in the first place like citizen management, not coming back. Spending allocation, not coming back. Without these civilization would have flopped in the first place. I do have four, and five on steam. Four does the job. Five doesn't. If things don't come back then I'm sticking with four. But as far as city building vs. colony building your probably right.
Have you tried Galciv1? That has what you are asking, there are no planet tiles.
Galciv1 has allot of good things that were dropped in the later versions, so its worth playing. The only significant thing missing is you don't design your own ships.
Also there are no 'fleets' in galciv1 so the AI tends to put up a very good fight, but they wont overwhelm you either if you are clever with defensive military starbases which are nicely overpowered
:) ..... eventually even unarmed sensor ships can defeat powerful enemy ships!!! that's what I'm talkin about
My fav ship was the good old battle axe