Yes, it bloody well matters. What's the point in getting some high-level concepts correct if all the nitty-gritty detail is wishful thinking and fantasy?

Instead, read Warren Buffett's letters to shareholders and take it from there.

As much as I have not been a fan of Buffett over the past dozen or so years, I can't vote this up enough. Even better, the shareholder letters are available for free on Berkshire's website (some pdf, some html.) A little searching and you can find his letters to his partners from his hedge fund days. Buffett & Munger are exceptionally good at what they do and they articulate their philosophy & the nuts and bolts of how they do it for free to anyone that is interested.

I remember reading one and thinking that it was more insightful than most finance content that is actually supposed to provide actionable information.

The details aren't fantasty: they're history. Times change.

He is even very clear that they were specific circumstances, and that it's not generalizable advice.

History is usually not made up. The guy is a huckster.

Agreed. I think that there was a lot of snobbery the way he says 'look at how I got rich, you're doing it wrong'. But some of his concepts are immensely valuable. I like how he pushes the idea of strong education in accounting, law, and other business essentials, as well as his use of networking and assessing of market conditions.