Like many other users I found that the game didn't generate enough habitable planets, even with planets and habitable planets set to abundant. I took a look at the xml in MadSetupDefs. The PlanetFrequencyExp value goes from 10(none), to 5(rare), to 2.5(uncommon), to 1.25(occasional), to 1(common), and to 1.5(abundant). The 1.5 looked like like a typo of 0.5. I changed it to 0.5 and am seeing significantly more planets overall using abundant settings. I believe that was the original intent.