It's the way that it occupies the context relatively permanently, that it doesn't come along with nice install/uninstall or discovery etc. is the problem.

'Skills' should all be based on MCP, they should load on demand, be very easily manageable and discoverable by humans and by AI, and then it would work

The scope was too narrow, given how it ended up being applied.

If they layer something on top of it, it may yet be revived.