You may find noteworthy that my comment had 2 points. One where I don’t feel like DoH will bring much benefit in the browser today, and one where DoH in general will just give you, the user, even less control over what you’re sending out. I can’t imagine everyone giving you the option to switch, all the TRRs being actually trusted, or even being able to pick the TRR in most setups (IoT? Your random Google product?).