I didn’t read it as a moral argument. It’s simply that if you only hang out with people that are very similar to you, you are very unlikely to encounter a diverse set of viewpoints and are more vulnerable to group think.

This isn’t isolated to tech, it would apply to any insular community. To use a tech analogy, if you trained a machine learning model based on the preferences and viewpoints of only people who worked in tech, you’d end up with an overfitted and not very general model.

Your brain is trained on viewpoints you are exposed to as well, and you risk over fitting your brain to a narrow set of viewpoints if you never leave an insular community.