Oh hey, that thing happened that one could easily see was going to happen [0]. The writing was on the wall for XSL as soon as the browsers tore out FTP support: their desire to minimize attack surface trumps any tendency to leave well enough alone. I wonder what the next step of removing less-popular features will be. Probably the SMIL attributes in favor of CSS for SVG animations, they've been grumbling about those…
Is that a good thing or a bad thing?
Technical people like us have our desires. But the billions of people doing banking on their browsers probably have different priorities.