> Eventually, the original guideline of HTML for structure, CSS for styling, and JavaScript for interactivity started to not really make sense anymore for many

> Eventually, the original guideline of HTML for structure, CSS for styling, and JavaScript for interactivity started to not really make sense anymore for many websites My emphasis added. There are still absolutely tons of sites for which the classical model works fine, and indeed works better than React at al, because pages load faster and behave more normally. Some of those sites are now built with React et al anyway, for some bad reason (cargo culting, resumé-driven development, etc). But still, most are not, i suspect. Classical web development is still a very useful skill. However, i suspect that although a majority of web sites don't involve React et al, a majority of web development jobs do - because the fraction of sites that are complex enough to need React et al also need a lot more developers! (a fact i think is fun: a majority of stars are in binary or multiple star systems, even though such systems are a minority of star systems)