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> Is XSLT still a thing?

On the frontend, not really. I built a small blog with XML and XSLT a few years ago and I was able to get things to mostly work, but XML and XSLT support in browsers is bad. It's been stuck at 1.0 with missing features for years and Chromium and FireFox both keep threatening to remove it. One day they will follow through with it.

I doubt it's still used much in web programming, but for backend data processing there are plenty of systems that output XML. XSLT is a great resource when you need to simplify a gnarly document.

I love XSL. There are some problems that it is absolutely stellar at solving. NCBI recently changed their JATS schema. No need to change any code, just modify the stylesheet and everything hums along as if nothing changed.

They come up sometimes in the GIS space when working with https://en.wikipedia.org/wiki/Geography_Markup_Language