You mean other than the 20+ web specs they added to platform (often to "fix" problems that they themselves introduced and/or that no one else has)? https://w3c.github.io/webcomponents-cg/2022.html (this list appeared after half a dozen or more specs had already been rammed through)

Or that their mere existence infects nearly every spec in existence delaying and needlessly complicating actual useful specs like Scoped CSS?