I don't think it has anything to do with echo chambers. It's simply that weak tie relationships are different than close ties, and very valuable. This narrative that we somehow are required to interact with people who are "very different" (often it actually means "offensive to us") is something that seems to be pushed by the US alt-right very hard. I call BS on it.

> Being forced to interact with people you haven't chosen to socialize is good for your mental health and for society.

That may well be true for some extroverted people, yes; it is 100% absolutely not true for "all people". You force me to interact with people I haven't chosen and there's a reasonably high probability that I'll subsequently choose to never interact with you again.[0]

> People interacting with different people are less afraid of the world, more trusting etc.

My childhood was largely interaction with people I didn't choose[1] and, nope, I am absolutely not "more trusting" as a result.

> Clustering into echochambers is bad for society as a whole.

Citation needed for that one.

[0] There is a slim chance that the people I haven't chosen to interact with turn out to be reasonable decent people who I don't annoy and, more importantly, don't annoy me.

[1] A bunch of enforced house moves and a paucity of decent locals at each new house/school.

Work is a fake environment where your communication is policed and you need to read books about how to effectively communicate to influence people do the things you want. Normals socialization isn't like that.

Not sure about this, most people would rather interact with people the like, click with than some boomer manager who thinks it's still 1950 IBM days.