I've used TeX since the 80s. I also find it surprising that nothing has come along to replace it. The entire LaTeX ecosystem is showing its age, and one of the

I've used TeX since the 80s. I also find it surprising that nothing has come along to replace it. The entire LaTeX ecosystem is showing its age, and one of the problems is that it is not designed for reading on variable width screens. TeX is all about typesetting on fixed-width pages. The real wizardry of LaTeX involves three things: 1. line and page breaks 2. hyphenation 3. mathematical typesetting. The first two are much less important today than they were in the 80s, because an increasing amount of reading is done on screens that are not fixed width. It's noteworthy that bibtex is also showing its age, and biblatex has not been a completely successful replacement.