> ...only allow connections to IPs that were received by DNS Works for a home / office setup. I think the main use of DoH is circumventing government enforced

> ...only allow connections to IPs that were received by DNS Works for a home / office setup. I think the main use of DoH is circumventing government enforced censorships, to an extent that it can. For ISPs to use "packet sizes" they'd need to run stateful firewalls at scale, which is unheard of, and possibly very expensive to run at that scale.