> I have friends that talk about themselves 75% of the conversation but nobody gives a shit because they’re interesting/funny/unusual/whatever and people like to be entertained.

What if you're talking 75% of the conversation, but the content isn't particularly interesting/funny? Is that still fine?

> Having a relaxed, natural conversation! “Have a few beers and relax and just talk normally”

Where "natural" and "normal" is completely clear and self-evident to everybody.

Most of these advices are targeted at people who struggle with social interactions. Many people are lonely without friends and bad habits like talking only about themselves won't help with that.

If you have great social interactions then great! You likely don't need such advice.

(Although I think most people could learn some "tricks" to improve their relationships)