For build pads on land, Enceladus was supposed to have re-added them after we took out the Engineer units, and we were pretty sure we had. If we missed some, we'll add them.
The satellites in space are completely useless, plain and simple. How would they help anyone? It's a single laser cannon. Any single hardship on any ship could easily take them out. Attackers don't need them for fortifying, because if you're trying to attack, then fortifying isn't a huge concern. For defenders, "forifying your position" would be better done with a single corvette than any of the turrets in the game, or better yet the Golans, which are intended for exactly that. Repair turrets never worked on hardpoint, and in GC the point is not to have long slugfests on single planets that require you to retreat, repair your ships and then everyone goes back out again; they're meant as one battle is one battle.
For pop cap on ground, it can't be any higher. There are only ten slots on land, and if you increase that, it breaks. When you compare the 10 land slots to the 40 space pop cap, and compare exactly how much that actually fits (with all except the most powerful ground units having more than one per company) it evens out.