Is PSTricks only a compatibility concern, or are people still doing new stuff in it? I can sort of imagine it... TeX packages are usually not the primary concern of the document author, so they will keep using what they learned 20 years ago.
When I wrote my diploma thesis in 2010, I was given the thesis template that the whole working group were using. It was a steaming pile of hacks that had accumulated over the years, with the recommended compilation method being latex -> dvips -> ps2pdf, and only using graphics in EPS format (IIRC). And people were still writing `\"{a}` instead of `ä`. I replaced it with a new template for use with pdflatex that took advantage of such new-fangled stuff as inputenc, cmap, pdfx and hyperref, and committed it together with a long rant of a README that started with something along the lines of "When I looked on my watch, it was the fucking 21st century."
Unfortunately, people are still using PSTricks for new stuff! I work with teaching materials at a university, and some of the people who wrote it first learned LaTeX in the 1980s, and haven't kept up with the three decades of improvements since. The obsolete hoop-jumping is kind of amazing, and I've been getting really good at complicated regex find and replace.
When I wrote my diploma thesis in 2010, I was given the thesis template that the whole working group were using. It was a steaming pile of hacks that had accumulated over the years, with the recommended compilation method being latex -> dvips -> ps2pdf, and only using graphics in EPS format (IIRC). And people were still writing `\"{a}` instead of `ä`. I replaced it with a new template for use with pdflatex that took advantage of such new-fangled stuff as inputenc, cmap, pdfx and hyperref, and committed it together with a long rant of a README that started with something along the lines of "When I looked on my watch, it was the fucking 21st century."