You can't possible make that assertion, because all it takes is one NSL and they will log and share it all.
For example, accidentally leaked internal network queries from companies are up to grabs. As is market data like what people are querying, how much, when, from where (geographical for example) and to whom, and so on.
The quality of the anonymization of private information are also not guarantied.
Like the one they had that just circled back around to the ISPs that regularly data-mine their users' traffic?: https://arstechnica.com/tech-policy/2020/06/comcast-mozilla-...
I’ll trust my ISP over Google or Cloudflare or Microsoft or DuckDuckGo any day.
Some <bad people> abuse <x>, therefore it is totally justified for us to impose a wholesale replacement of <x> with a solution that we can control centrally. It's for your own safety!
Never mind all the people that don't have data-mining ISP's, and to hell with end-user consent. We don't need that, we're working for the good of everyone. My piety trumps all!
Separately from that, there's the issue of how to transition over to DoH, in a world in which many ISPs and networks are hostile. That is the point at which browsers are using the small handful of early-adopter DoH servers and assuming on behalf of some users that they want to use those instead of the servers from their ISP or other network. That part is debatable, and involves tradeoffs between protecting users who don't understand DNS or security and supporting users who do.
DoH gives users the ability to ensure they're talking to the server they think they are, and not get their queries spied on or hijacked. That is the part I'm advocating here: having a protocol that cuts out MITMs and prevents spying on the network traffic. That doesn't solve the problem of needing a trusted DNS server to talk to; it solves the problem of not being sure you're talking to the server you think you are, and not being sure if some part of the network between you and that server is spying on you.
If you have a DNS server you like and trust, whether that's from your ISP or something else entirely, that's great for you! DoH would still be a better protocol to use to talk to that DNS server, rather than the unencrypted DNS protocol.
With, say, a proxy app on MacOS, I don't see how they could do this without consent?
Actually they do ask, by querying use-application-dns.net.
Notice that you could do this the other way: Query a value in the existing (local) DNS or DHCP that not only allows you to enable DoH but also specify which server all the local devices should use. Then if the DNS server chosen by the local administrator/user supports DoH, it could respond by saying so and you could use the protocol without changing your DNS server. But that's not how they did it.
There is also nothing wrong with using UDP for DNS. And the latency can be better, and in this context that matters. The real problem is that the UDP DNS protocol isn't encrypted. But there is no reason it couldn't be, except that then nobody gets a new source of DNS queries to data mine, which is where the money comes from to push DoH.