Dangerous how?

You can simply...not care.

Unless it's a context with a minimum required codex such as work.

But in your relationships, if you want to have meaningful ones, you need to find those where you can be yourself.

It's better to have 1 or 2 true friends (hell, most people don't have that many, you're lucky if you do) than knowing and being popular among dozens for a filtered/fake persona you built so others like you.

Doesn't almost every situation have a minimum required codex? Sure, you should be yourself with your friends. But if they are already your friends, then you are likely already interesting enough. I thought the article was more about how to be interesting to people who don't already know you.