Realized I was using Things as an expensive inbox and not taking advantage of any of its features. This Alfred workflow makes it easy to just add reminder to MacOS’s Reminders app with
r foo and you can specify a default list if you like.
I think this recent article about “The Rise and Fall of GTD” had an influence. I really just need a reliable inbox, not a whole system. Apple’s Reminders (across iOS and MacOS) is just fine for that.