[Suggestion] Fortifiable/Upgradable Bases
Abstract (TL;DR): Bases are able to be upgraded by spending air/mech/infantry resources to reward factions for holding onto them. This increases game depth by encouraging strategy in a less artificial way, and encourages defensive play. It may also help resist zerg forces steamrolling bases and help personalize and differentiate bases, giving players a better feeling of "owning" a base. This may be done with a smaller development cost vs other entirely new features by leveraging existing effects as the base upgrades.
Preface: As things stand in the game currently, there isn't much of a reason to own a base beyond helping to take the next base. There is no real sense of "owning" a base, and all bases are sort of homogenized where it's either a small base, or a larger base, or a facility and as long as it's one of those types there's not really anything else to know about it. In an effort to increase the sense of ownership of a base, and increase the differences betw