That is excellent for you. But you are not the world. I interact with people I'd label as "friends" where Facebook (or Facebook Messenger for some) is the only avenue I have for that interaction.
And for some, it's the only avenue I'd want to use.
I never said I was the world, but please take my statements in the context of close personal relationships.
If ones requirement is to maintain acquaintances, then fine. However, I was disputing the parent comment's assertion that leaving FB is akin to a punishment.
And for some, it's the only avenue I'd want to use.