To address your primary concerns about combat not being used with the thargoid CGs: Firstly, if the CG hits tier 1, a new weapon is going to be added, subsequent tiers merely expand the types of surface installations where they can be found. Secondly, the CGs are about gathering the raw materials to make the weapons or modules. How is going pew-pew on a bunch of NPCs going to help gather raw materials? Now then, where I think FD missed the mark was not adding a companion bounty hunting CG in the same system as the aegis CGs. Why? because some players like to put systems into lockdown for the lulz, CG systems especially. A bounty hunting CG can help to stave that off or prevent it entirely. Note that lockdowns have a minimum duration of 3 days. I'll let you figure out the implications of that. So, assuming you have caught my drift, combat can help an aegis CG, it just does so indirectly. And you don't need a CG to go bounty hunt to try to help keep a system out of lockdown, feel free to work the BGS for yourself. Help those who are trying to get you, and the rest of us, weapons. But I suppose complaining on the forums does require less effort and thought.
As far as combat CGs go: There have been combat CGs in the past few weeks, so its not like they are being ignored. And this week there are two of them. Congratulations, your wish has been granted.