What's new in TeX, part 1

One observation:

> and [TeX] might seem to be losing some relevance in our online world

Possibly not, maybe the contrary, because of the emergence of may cloud based TeX systems for collaborative writing, such as Overleaf - also known as writelatex (https://www.overleaf.com/), ShareLatex (https://www.sharelatex.com/) and more.

IMHO, a very interesting aspect is that being the TeX source a code-like document, it is naturally better suited for revision control than source formats for most WYSIWYG document preparation systems. For instance, you can put a LaTeX document in git and git will automatically be able to provide status information about what 'components' (e.g. pdf images to embed) have changed or to provide diff of the 'textual' parts of the document.

For the latter options to work well, it is better to stick to the 'old time' convention of using hard word wrap in the source file, rather than making huge lines as many recent TeX IDEs like TeXStudio do, though.