I can't recall exactly where this was discussed, but I think Guanathor had two objectives
1. give the minors a bit of a boost, and
2. make them a less profitable/unbalancing early grab for anybody nearby. Sure, you'll still get the class 15, but it won't be fully developed (in fact, they're mostly empty now).
Personally, I like them this way. It always felt cheesy to grab a minor and get such a disproportionate boost for such little effort
But only the starting buildings get deleted, all others will stay. Weak buildings get destroyed, strong ones can stay
And this is easily manipulated by trading techs to them. Which even makes sense, what else do you want to do with Minors - you actually can't trade for their ships, so everyhing MP related is lost. So what better as to keep their social queue busy? More moral/econ from improvements = more bcs for tribute, better labs = more techs to get from them etc
And if you play with a custom race using their tree then the whole tier1 generic improvments will globally be destroyed, against ~+60% enemy factions...
I think they are goofed up in some way. I "complained" about their low population before and got reassured that they would have been buffed, but checking now CustomRaces.xml nothing did happen so far.
So what do you think...:
Basically their population is reduced from 16b to 8b-10b, which makes their worlds far easier to invade.
I therefore propose a strong soldiering buff somewhere between 50%-75% for them , could be varied though to spice things up.
Reduced pop also means lesser economy, and actually economy is the strongest trait they have [+100% (!)] and they being able to pay tribute is basically the only thing that delays war-declarations...
(sqrt*8)/(sqrt*16)-1= 42% reduction in taxes, so how about getting them additional moral bonuses to compensate that (also to make Information Warfare less interesting in their case)
A bonus to miniaturization or logistics would probably also be interesting, donno their ships generally are so weak. In a way, it could be quite interesting to make them all unique in some regions. As of now, only Akilians enjoy better bonuses (they even get extra Loyalty )