We actually considered 'Optimised for developer sanity' as the strapline, because that's exactly the intention - you shouldn't have to learn a dozen new concepts in order to make interactive web apps.
Challenge to anyone who's interested: take 5 minutes of the interactive tutorials (http://learn.ractivejs.org) and see if we can't win you over!
@rich_harris I can confirm.
As a designer who learnt to code, Ractive is just getting out of the way, letting me do things the way I wanted them done without putting me into trouble :)
For people that don't want to dive into Ember, Angular or React, but still want a fast, powerful and live UI library that's been battle tested at the Guardian Newsroom
Svelte
Hull
Hull