> firstly, the node team seems quite happy for non-trivial amounts of the ecosystem to just be broken

yarn/node relations specifically are... complicated. On display on corepack (yarn project which got bundled into official nodejs distribution) issue tracker.

> secondly, it implies a lot of confidence that this feature will land before LTS.

This confidence is somewhat concerning. Will it get reviewed at all or has the "trust the LLM" mandate arrived at Node too now.