Hi harlan, I understand what you are saying. However, this raises a number of issues for me:
1. How is knowledge transmitted other than through experiential subjectivity?
2. If such knowledge can only be experienced, how is it that this knowledge appears in a number of different and seemingly unrelated systems? This tells me that someone must have taught or shown someone how to.
3. How is this knowledge preserved if it can only be transmitted through direct experience?

What you're saying is a valid point, but I don't want to sidetrack this discussion, as I'm specifically interested in the use of mudras with the specific intent of manipulating energy (for whatever purpose), and how this is taught within various systems that do (or profess to) use them for such purposes.