tl;dr:"The web is made up of technologies that got their start over 25 years ago. HTTP, HTML, CSS, and JS were all first standardized in the mid-nineties. Since then, the web evolved into a ubiquitous application platform. As the web has evolved, so too has the architecture for the development of these applications... The most popular architecture employed by web developers today is the Single Page App (SPA), but we are transitioning to a new and improved architecture for building web applications."
tl;dr:"If you're interested in how to productively build a maintainable website using modern tools that is fast all over the world despite every user getting content that's completely unique to them, then please continue."