I was going a different direction than I think you wanted
I had started with a bunch of stackable building, that are used to convert cost to balancing flaws in a planet, or amplifying its strengths, min/maxing.
you guys want more empire level stuffs
to mee, thats like having just the super buildings, and none of the regular ones
That's the plan. Focus and meters represent all planet development. Buildings and like wonders, and have far-reaching / significant effects, including modifying meters. You don't need to build more than a few buildings to get their effects on many planets.
also: when will we get asteroid mines actually in asteroid belts ?
Maybe never. Mines don't need to be built on the asteroid belt itself if they can be built elsewhere in the system and give the same benefit.
my reasons for the basic buildings initially were situations such as Rigel II. I think it was Rigel II, anyway, R II was a bad planet. It had an eccentric orbit. However it was near my homeworld, about 3 clicks away, and had an asteroid belt. Since I had an asteroid belt in my home system, I focus asteroid mine early to get a nice bonus. So I colonize R II. Well, R II cannot do anything but primary focus food. Cant build asteroid mines, can't build anything. Cant stabilize the planet.
Add appropriate techs or buildings to such stabilization over a wide area. There's no reason such adaptations need to be done for each planet individually.
Also, make sure the planets are connected for resource sharing, so the eccentric orbit planet doesn't need to feed itself, and can focus on mining to take advantage of the asteroid belt bonus. Planets are supposed to specialize.