You don't seem to follow. Millions of end-users get access to the Internet through major ISPs that monitor, log, monetize, and manipulate DNS. I'm on AT&T, and they absolutely do this. The purpose of DoH is to add a privacy mechanism that AT&T, or coffee shop wireless networks, or airplane wireless, or whatever, can't trivially disable. That's why it exists and why it's tunneled through HTTPS. Meanwhile, the reason network operators have a meme now about how much better DoT is comes down to the fact that they have middleboxes on their networks that passively monitor DNS, and they themselves (and, more importantly, the vendors that sell those boxes) want to hold back DNS privacy --- at least on their networks --- to keep those boxes working. They prefer a DNS privacy mechanism that has a kill switch that the network controls, not the user.

The idea that end-users should give a shit about any of this "L7" "purpose built" "control plane" "layering violation" nonsense, and opt themselves into a version of DNS privacy that their network operators can turn off for them without end-user consent, is lunacy; bamboozlement.