I think that just because someone masters a trade or skill doesn't mean they no longer use it on a very regular basis, possibilly even for a living.

I'm going to use a different analogy.

In Medieval times, there were knights, however one did not start as a knight. One had to also go through a period of learning, servitude, and so on. Early on in their life they served as pages, then eventually squired to an existing knight, and eventually became a knight or Master in their field, usually because all the other knights and/or king agreed they were worthy, and had been recognized.

Now a knight didn't stop fighting or stop living as a knight, just because they reached the rank of knight. They had a whole new set of jobs to perform after they'd be knighted. Everything from defend the kingdom, to taking on squires and teaching them the way of the knight.

I do agree with your assessment that a master much teach and pass on what they know, however because they are masters, they have the ability to do both teach and perform their skill on a regular basis.

I'm not saying that your wrong, I'm just respectfully disagreeing. You are more of an authority on the subject of kilts than I am.