I think the experiences are getting better. My first SPA projects were with Angular 1.x and for the whole duration that I was using it, I found that I could point out an Angular 1.x based site off of gut feeling / familiarity with certain pain points (hi Seamless).

I feel like there was a huge reduction in bug-prone madness when React + the Flux pattern started gaining steam. We are still collectively working toward an end (reliable software in the browser) but it's impossible for me not to feel the difference in the past few years, as a dev and a user.

SPAs are sort of a hack. The web was designed for documents that link to each other. Maybe they'll never be perfect until we reach some sort of impossible isomorphic framework utopia, but there is real progress being made