I prefer that type of thing where you have multiple bases in different areas of the map and you can upgrade parts of it and make it look better and unlock more rooms and such. Have an armory, shit like that.
If you mean what I think you mean, we’re on the same page.
Having predefined structures you unlock, augment, modify and expand = good.
Infinite freedom to pointlessly, laboriously, tiresomely, design and tinker with little practical benefit than cosmetics and novelty = bad.