Western Digital solves #2 and #3 for the MyCloud EX4 by somehow issuing real browser-trusted certs to each device for the domain device<mac_address>.wd2go.com u

Western Digital solves #2 and #3 for the MyCloud EX4 by somehow issuing real browser-trusted certs to each device for the domain device<mac_address>.wd2go.com using their intermediate CA "Western Digital Technologies Certification Authority" (https://www.censys.io/certificates/eb94f8e2c8d0c8338bb8ba40e1ead6224b842cbafc99f269eef0761e839c41a6 https://www.censys.io/certificates/eb94f8e2c8d0c8338bb8ba40e...), which is in turn issued by COMODO. Now, not everyone has an intermediate CA locked to their own domain, but maybe that's the issue? X.509 has the ability to restrict CAs to particular domains (e.g. see the "path constraint" on WD's CA in the info link above), so if it was easy to be issued a CA cert for your own domain, couldn't that be a potential solution to this problem?