I actually noticed the same. Having it work on Mithril.js instead of React seems (I know it's all just kind of hearsay) to generate a lot cleaner code. Maybe it's just because I know and like Mithril better, but also is likely because of the project ethos and it's being used by people who really want to use Mithril in the wild. I've seen the same for other slightly more exotic stacks like bottle vs flask, and telling it to generate Scala or Erlang.