I mean, I know you're joking, but people agree on the easy stuff (mostly, I guess), so all that's left to figure out is the hard stuff. It's true that people have spent thousands of years thinking about epistemology, but my impression is that it's not a solved problem at all.

I know right? Wittgenstein solved the whole thing in 1922 and yet here we are 100 years later, still acting like "knowing the truth" is a hard problem.

(Here's hoping I can avoid the wrath of Poe's law)

Wittgenstein demonstrated that knowing the truth is not hard? Does this refer to a particular publication or idea?