The problem is that browsers and other applications are just unwilling to let the user see how their products work or decide anything for themselves--or even just architect their installers to involve dependencies on a shared resolver upgrade--and so we end up in this hell of applications actively hiding their traffic from you.
And like, "great": now we have a new version of DoH and have to wait for everyone to upgrade their apps that upgraded to DoH before? This is ridiculous bullshit... this should be a single app on your device you now upgrade. Hell: Cloudflare even develops that app for a number of platforms! They aren't even the problem... it is everyone who jumps on "embedding" this behavior :/ :/ :/.
(For a more technically-comprehensive rant about this, read my comment from a year ago:)