I have to agree on that analogy...
I have worked my hands in wood for over 50 years now and considered myself a master craftsman a few times over the years ....But then i discovered another rabbit hole or specialty i hadn't worked with...I prided myself in my finish carpentry abilities, and being able to accomplish it with just hand tools alone when necessary. I spent 20 years accumulating and mastering different skills in the construction industry just trying to stay busy after my apprenticeship years. I worked with a mason and learned to lay stone, worked with tile and marble for a couple years too as a tile setter/ general contractor. i did all kinds of remolding of homes , finished flooring, and a bunch of custom cabinet work too. I built many spiral stair cases and learned about bending and laminating those cork screw hand rails and fitting the various pieces together. And i build some cool furniture over the years too.
But.... Then i got introduced to building boats with a group of luthiers and highly skilled craftsmen for several years... Wow! So much for my self proclaimed Master Craftsman status.

That boat building experience opened my eyes to some serious education in millwork and machinery i'd never used.
i had an opportunity to build a couple free standing spiral stair cases out of Teak from rough cut S2S stock.
THAT was an eye opener and a huge undertaking. i'd be willing to bet out of 100 so called master craftsmen only a couple could even explain the procedure for such a project, much less build one...Most of my time at the ship yard i spent building radius top raised panel doors from scratch and installing them in the boats.
So at that time, i considered my time spent building boats as my masters degree in finished woodworking...
But Nooooooo.....
Then i started building bows, and studying the arts of building an acoustical guitar..... And after 15 years of building bows of my own designs, i'm not even close to Master bowyer status..... It's endless guys... You will never learn it all, much less master them all. We just don't live long enough to do that...Too many rabbit holes..... Kirk