I'm struggling to see how this is different from prepackaged prompts. Simon's article talks about skill metadata being used by the model to look up the full prompt as a way to save on context usage. That is analogous to the model calling --help when it needs to use a CLI tool without needing to load up the full man pages ahead of time.
It's the fact that a collection of files are tied to a specific task or action. Prompts are only injected context, whereas files can be more selectively loaded into context.
What they're trying to do here is translate MCP servers to something more broadly useable by the population. They cannot differentiate themselves with model training anymore, so they have been focusing more and more on tooling development to grow revenue.
But couldn't an MCP server expose a "help" tool?