How hard it is to get things right? It's not hard at all. It's builtin with frameworks like Ember or Angular, and for React you got react-router which does thin

How hard it is to get things right? It's not hard at all. It's builtin with frameworks like Ember or Angular, and for React you got react-router which does things correctly by default. It's just bad programming. I don't even understand why people would make an SPA without a url-router. Doesn't that just make development harder/more anoying? Why would links take longer to load in a SPA? CSS, Javascript and the like should already be downloaded, there should be much less networking involved. Also. My SPA's come in at around 120-130kb minified (no gzip). That's about the same as "pure-html" sites which include jquery. I do agree with your last point though. Pure content sites, or even "mostly"-content sites, is probably better off with backend generated html.