In this case there is the vocal minority who uses it, and then an even more vocal group who was just reminded XSLT even exists and is protesting its removal on vague ideological grounds. The proposal has clear mitigations for websites or use cases that depend on it, e.g. a WebAssembly polyfill.
The polyfill is a distraction; it does nothing for the use cases in the wild unless it's shipped with the browser, which is basically orthogonal to the spec and in any case Chrome was not willing to do.
I dont think the web assembly is a great polyfill, at least for the <?xml-stylesheet processing instruction. The better alternative is to just use CSS which is powerful enough for most real usecases.
