The main advantage of skills is defining a process that is at least vaguely consistent across different executions for a given task, and plugging in some of the common pitfalls an LLM might fall into for some of those executions.

But to me, both the process and the pitfalls are going to be heavily specific to the individual or team, and to the work they are doing... It's something that evolves over time as you bump into repeated rough edges.

Taking someone else's skills and blindly applying them to my situation feels odd. I don't know what rough edges those skills were made to address, so I have no reason to believe they would fit my specific needs, initially, any better than the baseline LLM.