I would tend to agree with @John_Harshman
Echo chambers can as easily develop due to self-selection bias as by being imposed.
And I do think that this forum does have a degree of self-selection, towards those with a high regard for empirical evidence – mostly scientific evidence (unsurprising given the number of scientists involved), but also demographic evidence and so forth.
Speaking for myself, I don’t find that bias detrimental – but hey, I self-selected here myself – and I’m not a YEC trying to make my case against such a headwind. 