I just find it hard to accept that almost every planet, except for a handful, is not suitable for human habitation. Most of them aren't even the proper size; gravity can either crush you or microgravity will also fuck you up in the long run.

Making OC planetary systems is just so weird because you have to add at least half a dozen useless planets. And that's accurate to reality, look at our own system!
Mercury is abandoned but useful, but how do people live on Jupiter's moons? They are small and Jupiter is radioactive. I could picture a forge fane on Io, Europa at least has water (though 0 energy) and Ganymede has an okay size, but the rest don't look so good.
Even the Moon doesn't look good. How do people live there? Ain't no volatiles or biosphere