Ecus without normal planets are worth nothing, apart from exploitative market schemes, while Gaia planets without Ecus are completely viable, bugs aside.
Well, technically, an Ecumenopolis can be self-sufficient in energy via trade value, and food by using livestock (they graze on the street trash or something). And if you have a matter decompressor handy, you can theoretically get by without using the galactic market OR having normal planets at all
Many people talking about the alleged overpoweredness of Ecus are actually basing that on rerolling their game until they are in the First League area.
But this part I very much agree with.
Tellingly, noone has yet brought up the major difference between hive/gaia/machine worlds and ecumenopoleis; the former are advanced terraforming options, while the latter is a decision (really a build option, since it takes the form of an item on the planet's build queue) requiring you to do the following:
- Paying 200 influence,
- Paying 20k minerals,
- Clearing all blockers (usually requiring either terraforming or tech)
- Saturating the planet with city districts,
- Sacrificing all deposits and beneficial planetary features
Those requirements are no pushover. And sure, I know, you just need a few of these. In fact, if you roll Fen Habbanis, you're probably tempted to skip the ascension perk altogether, because that planet alone can provide the 250 metallurgist jobs you're looking for- and yes, alloys is the main point of ecus and they're pretty terrific at producing alloys.
To sum up, ecus are more costly, more specialized, and leaves you without an advanced terraforming option for the remaining 90% of your planets unless you take a second ascension perk for your trouble. Are they good? Yes. Worth the perk? Absolutely. In need of a nerf? Not so sure. There's no question that machine empires are terrible right now, but that's not because of ecus or machine worlds. Conversely, hives are in a pretty solid place and I'm not convinced that their lack of access to ecumenopoleis put hives at any kind of unfair disadvantage.
With that said, I'd definitely give
Fen Habbanis a wack of the nerfbat. Make it size 16 for starters, and up the cost of clearing those blockers a bit.