That's the point where it gets tedious for me. At some point it's just painting with MS paint. I have drones that can build anything i draw, i have supply lines for the resources to build those things, I've launched the rocket already, even the turrets and walls are auto repaired/replaced and the bugs are irrelevant.
It was fun to get there and i always had some goals to acheive. But at some point it's done and dusted with 0 replay-ability.
I will never understand the mindset of those that build Megabases.
Fortunately there are mods to fix that.
I had a whole slew of complaints about the vanilla game, but found that mods already existed to fix virtually all of them.