[JdeBP]

One can even run a private root content DNS server, and not be affected by root problems either.

(This isn't a major concern, of course; and I mention it just to extend your argument yet further. The major gain of a private root content DNS server is the fraction of really stupid nonsense DNS traffic that comes about because of various things gets filtered out either on-machine or at least without crossing a border router. The gains are in security and privacy more than uptime.)