I liked XML 1.0. I gave up after getting tired of the standards community not prioritizing users - the thickets of interdependent specs, dearth of good documentation, and critical lack of work on quality implementations of the standards (e.g. no decent editors except $$$ oXygen, libxml2 and Xalan never implementing XSLT after the 90s, often missing or conflicting examples of anything non-trivial, etc.). I really wish there’d been an effort to focus on the basics so there wasn’t such a gap between the vision of the standards committees and the lived experience of most users.