I'm still undecided on whether XML is brilliant or a tarpit. Xsltproc segfaults on large files which is a bit dubious, and webassembly is refusing to run parts

I'm still undecided on whether XML is brilliant or a tarpit. Xsltproc segfaults on large files which is a bit dubious, and webassembly is refusing to run parts of libxml2 on the grounds that memory accesses go out of bounds. Browsers seem to have abandoned it. I do want an extensible tree notation though and it does have a lot of existing tooling. Some of it quite good. Am I stuck in the mires of sunk cost, or am I wisely not implementing a DIY tree transform? Hard to see from here.