Writing an app is like coding for LaserDisc
"The earliest websites are viewable on modern browsers."The problem with this statement is that a website is not the same thing as an application. The web was designed to publish documents, it was never intended to build applications. Saying that a document from the early web is still viewable while a fully interactive application from the same time is not is a bit disingenuous.As a platform for developing interactive applications the web is simply terrible. There is no good way to develop a UI in HTML/CSS/JS, all attempts to do so rely on layers upon layers of wat are essentially hacks to build something resembling a UI toolkit on top of a document markup language. The result a UI that is unnecessarily complicated and fragile. Laying out and rendering HTML and CSS is incredibly complex compared how traditional UI toolkits do the same task. That complexity comes at a cost, both in development time and in UX.