I really hope that more developers would focus on the roots of web development: HTML and CSS. In the past years the whole JS thing got bigger and bigger and you see so much simple and small websites being developed with React, Vue or whatever fancy framework is trendy right now. Only a small portion of sites really need a full-JS frontend that communicates with the backend via APIs.
Development of progressive web apps makes a lot of sense and should be done more, and JS being used to add extra functionality and not the other way round.