I think they get more functionality faster. As a developer I find it much faster to iterate on a SPA architecture than on the server-side rendering model. Plu

I think they get more functionality faster. As a developer I find it much faster to iterate on a SPA architecture than on the server-side rendering model. Plus if you ever make native apps, it's nicer to manage a single REST API on the server side, rather than bifurcate into an API model and a DOM model. And you can generally get "good enough" performance that way without too much difficulty. Given performance of most devices, I'd say pushing UI from the server side as a performance optimization is high effort low reward in most cases. Unless performance is one of your major differentiators. That said, there are certainly some sites that miss the performance boat completely such that their sites are almost unusable on lower power devices. It's a tradeoff.