Even better, IMO, would be if all targets were also proxies and a client could choose -- at "query time" -- any combination of (proxy, target) that they prefer.

If you wanted to go a step further, you can even allow "chaining" of proxies, such that the path a query takes might be, in an extreme example, similar to how Tor operates:

  Client -> Proxy 1 -> Proxy 2 -> Proxy 3 -> Target -> Resolver

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Anyways, this is kinda sorta interesting, I guess, but honestly I'm more excited by and looking forward to the (hopefully!) eventual adoption and roll-out of "DNS SVCB and HTTPS RRs" [0] -- one of the other I-Ds (linked in the OP) on which ODoH is built -- and I suspect many other HN'ers will be as well (although I'd happily settle for SRV RR support in browsers).

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[0]: https://tools.ietf.org/html/draft-ietf-dnsop-svcb-https-02