Yeah I just ran through the reference list - the most obvious thing is golems - however, I don't play with AI golems on, and this is a bit niche to count for much IMO. They're supposedly cap for cap slightly faster at taking out higher energy fortresses than bombers, but I'm pretty sure they're also a lot easier to kill, so not sure how the math works on that.
Thing is, they don't really come into their own until the 8-10k mark. I had a look at the recent(ish) change in the formula from Sqrt(energy) / 10 to 1 + (energy/1024). Basically they do a fair amount less damage under the new formula to anything with less than 7000 energy, which is almost all guardians and starships. At the moment, they're a real niche case, only useful against the odd high energy starship (zenith starship, warbird, core?). I don't think that justifies them - I'd like to see a buff against the 1500-5000 energy range, to make them at least moderately useful against more common guardians and starships, otherwise they just aren't worth my time.