Please excuse my curiosity: would you consider your work to be more hands on or managerial or both? Have you ever felt overwhelmed with the sheer amount of 'topics' out there?
Overwhelmed, no. More excited by advancement in knowledge. I'm more frustrated by the number of subjects that could be investigated that go un-explored.
So in a 40 year career you can master about eight to ten skills.
I didn't say I'm also an artist.