I'd say that Sales is the most difficult part.
I've been manufacturing since the 1950s, I was born in manufacturing families, I could sharpen a lawn mower blade or repair a broken bicycle spoke when I was 10 years old, we are those kinds of people.
The Sales People were/are the beautiful people, they are always nice, well dressed, nicely groomed, polite.
We factory people talk "Shop-Talk" which can and does slip out occasionally & embarrassingly.
Tyll seems the Analytical type that mostly exist in the Engineering Labs, where they speak "accurately", think "accuracy", value integrety and create ( for themselves ) a unique persona that helps them stand out as an individual.
Our Tyll also seems to have a few extra gifts: Linguistic abilities and social skills that are "wide enough" to allow work in Public.
Tyll & Co. are our source for accurate answers ( including JA ).
Even the most intricate manufacturing is not difficult, we're standing on the shoulders of manufacturers going back 200 years.
Explaining Politics to my grandchildren is difficult, phew.
Tony in Michigan
ps. go back to RMAF11 and see how Tyll has 'polished' into a "Camera Ready" Public Personality. ( while Steve G. is vloging in his underwear ! ) god bless em