Expertise can be a relative term I think. There is something to be said for being a jack of all trades and while you may not feel you excel at any one thing, there are plenty of people who would disagree. There are many people who know more about computers than me, but to others I am like a tech god. The same is true with Blockchain. It all depends on your familiarity I think.
Experts tend to be a bit blind to what they don't know also - because they have skills in one area, it doesn't mean they translate. One of the things I have found in crypto for example, is that pure tech people don't get it, pure finance people don't get it and neither of them know how it interacts socially. Yet, they both "know" it isn't going to work.
Yeah, that is a good point. Just like so many gamers that are opposed to crypto for whatever reason.