Mmm. By that definition, I would not define the software I built as "complex". But I also wouldn't define Facebook, GMail or Stripe's web app as "complex" eit

Mmm. By that definition, I would not define the software I built as "complex". But I also wouldn't define Facebook, GMail or Stripe's web app as "complex" either, and I see folks using very complicated client-side technology to build those "simple" apps. I use intercooler.js, which I built, and which I shill heavily because I'm quixotically trying to fight the Facebook/Google 80's-style-thick-clients-in-javascript zeitgeist.