Proverbs 11:14 Where no counsel is, the people fall: but in the multitude of counsellors there is safety.
The reason there is safety in the multitude of counsellors is because you get a diversity of perspectives, coupled with the wisdom which comes from experience. Echo chambers, on the other hand, are very unproductive. Sure, they may corroborate your opinion, bolstering you in such (which is pride). But if you walked into the echo chamber wrong, you’ll leave the echo chamber just as wrong as you entered. That does no one, including yourself, much good.
Iron sharpens iron (Prov 27:17). Faithful are the wounds of a friend (Prov 27:6).