I don’t see any inherent problem with the two things you say are problems: neither DoH, nor the idea that a browser can override default settings.

I’m not a fan of defaulting to Cloudflare, but this seems more like a case of picking your poison. Somebody’s going to get a crack at the domains you’re visiting, are they not? It seems better to encrypt these queries than to allow a middleman to intercept them.

Regarding override default system settings, is this really a problem? I prefer browsers that give people extra options, and I would find it worse if they suddenly took this option away.