OK, you being Devouring Swarm answers some of my questions. Especially not having to worry about Consumer Goods. Still, 40 worlds by 2300? That seems like a lot! Is this from conquests or were you just constantly pumping out colony ships? I think I'm just not expanding fast enough if you have that many worlds after just 100 years. I have basically been plopping down 1 expansion until I hit 10 pop and can upgrade it, then I send out another one. In retrospect, this is probably much too slow.
I colonise very aggressively most of the time, as non-hive too but especially as a hive, because the drawbacks for doing so are lessened as a hive mind. Unless I am a Fanatic Egalitarian I also often keep building slots open on planets so that I can quickly resettle pops from them (without ruining buildings) to new colonies to get over the new colony threshold at 10. I did conquer a bit but not all that much. I can't rightly remember how early it was but I did absorb two other empires, probably both before 2260. Neither of them was very big. I think there are a lot of people who do it the way you do it. Me, personally, think that that is too slow. I've found expanding very quickly to work out much better for me.
Hive minds are pretty OP in 2.2.2 IMHO. They have:
1. Incredible amounts of unity without ever needing a dedicated unity building.
2. Much higher pop growth than other organics
3. Much easier science, since their upkeep is only minerals, which they can get in insane amounts via hive worlds. Same for pop upkeep.
4. (though that does not apply to DS): Can offset their energy weakness (for having no trade routes) via the broken galactic market.
1. Is this referring to synapse drones? They replace administrator jobs which are just much better.
2. Yet they have less than any organic empire starting with mechanist, and also less than regular organic empires once they get a bunch of migration treaties rolling. Yes, the latter takes a while to get going but this coupled with points about needing more pops in number 3 takes away from the actual growth bonuses hive minds get.
3. There is a counterweight to this, and that is that while they don't need to use GC for this, they also use an absurd amount of raw minerals in exchange. They use 6 minerals in exchange for 4 science, whereas regular empires uses 2 CG that is made from 2 minerals (less in practice because modifiers apply to the extra production step) for the same gain. They gain by not having to use pops for that extra step, but they need more pops on the base job in exchange. Not having to use GC is great, but they use a lot of extra minerals in order to do it that way, and while Hive Worlds are great to solve this, they don't start with them. They also don't have access to a Mining Guilds equivalent, nor generate value through trade or trade agreements.
While they have their benefits they also have their drawbacks. Their amenity generation is absolute trash in comparison to regular empires so they have to dedicate more pops to it. The lack of happiness also means that their pops will generate more deviancy than most regular empires generate crime, and as thus need more pops on jobs that reduce that. They also don't get the production bonuses from stability for free in the way regular empires often do because they don't generate incidental amenities. Having only two stops in the production line (miner -> scientist) rather than three (miner -> artisan -> scientist) means that their modifiers only get applied twice rather than three times, so they scale worse into the late game.
Don't get me wrong, I very much consider their upside. People in general completely gloss over the negatives though, which is problematic because the negatives are very real.
4. Anyone who does that is just blatantly cheating. If that's something you want to take into account then the only thing that matters is how fast you can tech and how many shipyards you can have.
I think hive minds are good, but excluding devouring swarm I don't think hive minds are better than tuned regular empires. Devouring Swarm is very strong, but if they are 50% stronger (not actual data, just thought experiment) than a regular empire I don't think that's unreasonable. Being as strong as one and a half non-genocidal empire feels about right to me with all the drawbacks and ganging up that comes with it.