Yeah, I know, you’re thinking, “But I never leave the US. It’s so big an amazin’ and shucks, I don’t wanna leave.” That’s all fine and nice, but by not having a passport you assure that you can’t leave even if you wanted to. Say an amazing flight pops up to Mexico or Tahiti (still have my fingers crossed on these). You can’t even reserve that flight if you don’t have your passport as it’s a minimum of a month to get it the first time around.
Do what you want. Stay here. I ultimately don’t care other than the fact it means less American tourists for me to deal with.