This advice is not for everyone.
Obviously this works only if you are an extrovert. Introverts would find this kind of interaction a wasteful use of limited social energy available to them.
Not sure why you got downvoted with a perfectly valid opinion!
I’ve done what OP describes but I’m heavily introverted and likely HSP too. I’m pretty good at it but it’s incredibly exhausting. My father is exactly the same way.
As I get older, the more I consider self care and prioritising my own needs over others to be happy. To that end, I much prefer to keep to myself and so I do.
However it doesn’t stop me from engaging in impromptu conversations. I just don’t go out of my way to talk to literally everyone.
This advice is not for everyone.
Categorizing yourself in a way that may purposefully stunt your growth and reduce opportunity for growth is a wasteful use of life.
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I think it absolutely is for everyone, especially for introverts. It's a muscle, go train it. Source: me.