"If I have seen further it is by standing on the shoulders of Giants." - Sir Isaac Newton
I am occasionally consulted as an expert, in certain subjects, by friends, family and sometimes even acquaintances. It is not, however, a one way thing. If I know someone with specialist knowledge, I will consult them on matters relating to that knowledge: it just makes sense. As I said, it's others who judge me to be the expert, not me, and I certainly don't believe I will ever have the necessary arrogance to consider myself a master of anything.
If I accept the notion that I have specialist knowledge, however, as there is clearly evidence to support this, then how did this happen? How did I, or anyone else, surpass the knowledge of those with a passing interest in specific fields? The clue, I would suggest, is in the question. I know more than someone with a passing interest.
How easy would it be to develop a working understanding of something in which you have no interest? It would be difficult, wouldn't it? How about going beyond a basic understanding to a more comprehensive appreciation? I don't know if it would be possible, but I expect it would be something akin to torture.
Becoming an expert in your chosen field takes patient study or practice, often over many years. This can seem like a chore or, if you're genuinely interested in what you are doing, it can be very enjoyable. Why would you choose to become an expert in something you don't enjoy?
Let us pursue those things which bring us joy in the pursuit of them.