[IMTDb]

> You can argue that it would be better for those sites to be subdomains of a single unified domain, but when the sites were created there wasn't any compelling reason to need to do that

I can also argue that Safari and Firefox have been blocking third party cookies for years now. So stack overflow has had plenty of time to adapt and migrate to the "right" organisation.

To me it look like either they care about allowing unified sign in on their various domaines, and they should have migrated to a subdomain model a long time ago, because users of Firefox, Safari etc have been negatively impacted for a long time. Or they do not care that much (which is fine), but then chrome blocking third-party cookies and the discussion around first party sets should not concern them too much.

[thayne]

Or, they do care, but not enough to spend the significant resources and opportunity costs to do something about it for the minority of users who don't use chrome. Of particular note, changing domains can really hurt SEO.

[ddtaylor]

> for the minority of users who don't use chrome

Replace "Chrome" with "Internet Explorer" and we're back to 1999.