I agree - have yet to see the benefit of using a framework that aren't at least 2 years. Never do client work using newly released frameworks (if that isn't specified as a must by the client). The result will come back to bite you sooner or later.

I like the idea of universal code, maybe Sapper will be the solution that comes out winning. I'll let the community be the judges and hop on the train a year later if that's the case.