A follow up.
For people complaining that ideology is too easy to get on larger maps, just set your planets to Rare.
Started up a new game and decided to give the Yor a whirl. Somehow I set everything to random and... well... I'm on turn 101 and I'm about to colonize my ninth and tenth planets. On an Immense map. It's a scattered galaxy, but shouldn't matter that much when it comes to the total number of stars.
It's not like I'm shirking things, as I am #1 in UP votes and am close to the top in # of planets held. Near as I can tell, the Terrans have the most planets in the game.
They have 10. Again, on an Immense Map.
And it's not like I haven't explored. So far I've found around 120 to 140 star systems (it's a bit of a PITA to accurately count without sector lines). And in those 120 to 140 star systems, there's been 14 total planets that are colonizable, including extremes.
Gonna need the ideology buildings in this game I think!