There are times that I'll google some idea, person etc that's new to me. I don't feel any shame in admitting that I'm not an authoritative expert on every possible subject under the sun.
Also, one of the pleasures of discourse, for me, is learning about new things.
Whenever I come across someone [there are a few of them here] who talk as if authoritative about almost anything, I assume some googling is going on. It's possible that some people have gargantuan stores of knowledge on all subjects, but I don't think that's the case, in general.
For one thing, most people aren't sufficiently interested in absolutely everything, to spend the time to become authoritative on all subjects. There's vast amounts of information out there. Which is why we tend to see specialization to specific fields and areas, and even to subcategories within fields. A university History department will have specialists in American history, British history, etc.
You don't see too many 'Professors of Everything' anymore.
However, I do think that here at U75 [and elsewhere on the internet] we have a number of 'Masters of Profundity'.