I would agree with the post, in this case your dad knew a lot about his trade, so it wasn't a new industry for him.
The coffeeshop example is great, i've seen that a couple times, where people that like drinking coffee, open a coffeeshop, and since they don't know a lot about beans, or equipment, they end up doing bad purchases, choosing bad providers, and the result is just bad.
my neighbor is a coffee roaster and started with production in his garage
when i visited he showed me the setup and i had a bunch of questions to unpack the production situation. he told me id been more interested than anyone who had visited which surprised me because hes very popular with many local lifelong friends frequently parking in the cul-de-sac
its an engineers nature to want to take things apart