Even the fanboi argument of "oh, Bactrians aren't the best at everything, they're just the most flexible" is laughable, because they're basically "jack of all trades, and master of most"...
This is exactly my grievance. The real shame is that it seems as if lots of effort went into balancing outfits. For example, Wanderer outfits are a nice balance of features (heat, power, weight) but you can get better pure performance out of dedicated outfits.
Even outfits are not perfect, the new Hai thrusters seem a little underwhelming and mostly seem to fit a niche in that they occupy odd-mass-numbers in between the superior Deep thrusters. Hai powerplants are efficient, but generally worse than others, or so they seem at my casual analysis.
The new Kor stuff appears to be generally "better" than most things, in terms of dedicated power output, cooling, and those awesome "core" devices. But there are cases where I'd rather have Wanderer outfits, or Hai. So that is balanced, right? There are various reasons to prefer one over another in different circumstances. That is sort of what game balance MEANS.
But the Bac... you cant even begin to make arguments for other ships as you can with the outfits above. It is just better. If it is going to be the jack-of-all-trades, then fucking MAKE SURE that there is a better troop ship (there isnt). MAKE SURE there is a better cargo carrier (there isnt for flagship boarding/raiding, but there is for crew-to-cargo ratio). MAKE SURE another heavy hull out-guns it (only carrier/cruiser have more weapon capacity). And do it with human tech, which should be vaguely balanced against its self.
If some alien ship -- or even the Kestrel -- was quantifiable the best, I wouldn't have such a problem with it. But the Bac is a common hull that anyone can buy and is just plain better. And there is no desire to fix it.
I saw the developer state that it was balanced in terms of price, that a legion of smaller ships was better economically. I feel like that is kind of bullshit; by the time you are buying fleets that size, price is less of an issue than managing your ship inventory. I don't want more than 10-20 ships in a fleet, the notion that 100 light warships should replace 10 heavy ones for the same cost is just silly.