Hah, great example, I can work with this
Are you also a fellow enthusiast?
Ok, so on to your example.
You’ve discovered track riding, someone suggests a book by Keith Code to help you on your journey. You get a book learn about SR’s (Survival Reactions), learn about braking into a corner, setting up for that corner and driving out with positive throttle, ratcheting and so on. You’re maybe a year or two into riding on the track learning the limits of braking straight up/down, maximizing corner speed, etc. Your aspirations aren’t to be Rossi, but to enjoy getting better/faster nonetheless.
You sign up to a forum of fellow enthusiasts and someone named Jason Pridmore is tell you if you want to get faster in a shorter amount of time, just drop that Keith Code nonsense and start learning to trail brake, NOW. Code may have successfully taught thousands of people via his book, but they're not as fast as me. You ask questions such as how do you know where the limit is for your level of skill, bike setup, suspension setup or tire and he says "you’ll feel it after you’ve done it enough. We’ve been riding for all these years and we know where it is, so naturally you’ll learn it too."
Now keep in mind, Pridmore may be right, but he’s not coaching you, he’s not monitoring your progress and he may not realize how many other non-experts are reading his advice and heeding it just because he’s a supposed expert. It may be great advice for some people and not others. People with limited riding experience can’t implement it for many reasons. Maybe as the years go by and they get more track sessions under their belt they’ll remember "Hey, I have a good feel for my front end and I remember Pridmore saying something about trail braking hard into that corner. Let push a bit harder than I used to, start connecting the dots that I've learned and seeing how much faster I can get."