[watwut]

It is pleasant to live in echo chamber and that is exactly what you would build there. And the result is place where people don't talk about issues and don't solve problems if doing so would go against groupthink. And just like in any echo chamber, consensus will more more toward extreme and people will simultaneously become less and less capable of handling different opinions.

[omginternets]

The key phrase you seem to be (intentionally?) missing is "to some extent".

There's a continuum between "echo chamber" and "agreeing about nothing".