Replying to #31:
I can't answer that, as my first exposure to the game is 1.2. I presume they were struggling with game balance issues related to large populations. And believe me, I'm looking very hard for a reason to boost planet populations in this game... I just haven't found a good enough reason yet.
Keep in mind that most of the posters that are talking about farming bonus tiles also are telling you not to research the farming techs (those that increase your farm output from 4 to 6 to 8 to 10 each). I find that approach lacking, for three reasons:
1) If you use a 100% farming tile, you'll have 13 billion on a planet. Research even one tech, and that's now 17. Not so bad in itself, but what about all those other planets that DON'T have farm bonus tiles? Are you building 2 farms on them? It seems to me, that in this game, homogenous population sizes are to your advantage, as you can control your tax rate much easier. When you have a bunch of planets at 17, and the rest at 13, you're losing out on the money you'll generate on the 13Billion population planets. So, you're costing yourself either money, or tiles. I then pose the question: If you say the farm bonus tiles aren't useless, you ARE then saying the farming techs ARE useless, yes? Either way, something's useless in the game.
2) Again, regarding transports, why not just build 1 transport each on a bunch of planets? First off, you'll produce them faster (more planets making transports simultaneously). Secondly, your population will recover faster (again, more planets growing population back simultaneously). If you're having a problem generating troops, consider manufacturing transports on these worlds every time they cap out on population, even if you're not at war. Then, when you do go to fight, you'll have an armada of troops at your disposal.
3) Regarding morale, it IS significant when you start growing large populations on some of your planets, as you will either have to suffer a morale hit on those planets, or drop your tax rate. Dropping your tax rate costs you money, and suffering the morale hit does nothing but make it more difficult to win your elections at the higher forms of government. And if you're running on the borderline of winning elections, watch what happens if you lose a morale galactic resource. There goes your economy, because then you'll HAVE to drop your taxes to avoid losing an election.
I have yet to see any decent reason, that doesn't cost you in either tiles, or in tax revenue, to put more than 1 farm on a planet.
I might consider, at some point, trying out a mod that does nothing other than make basic farms produce 2 food instead of 4, with the techs making them go from 2 to 3 to 4 to 5, instead of 4 to 6 to 8 to 10. It will require using more tiles for food overall, but you'll also have much more control over your populations, and you can go back to being happy when you find at least a 100% farming bonus tile.