But the final bit in this post is really where I'm at: I have no idea where to go from here.
Currently on mobile I use Orion--it's the only mobile browser I've found where setting up AdBlocking is reasonably easy. Maybe I'll try it on Desktop.
But this doesn't really address the issue of there being only one rendering engine out there because it uses WebKit.
That's a good question. Mozilla has something like a half-billion dollars of assets, which is more than twice what the Linux Foundation reports. Does maintaining a web browser cost more than twice as much as maintaining an operating system? Hopefully not, but maybe it's time we find out.
https://apps.apple.com/us/app/ublock-origin-lite/id674534269...
https://apps.apple.com/us/app/wipr-2/id1662217862
on android I use firefox with the regular ublock origin extension
full disclosure: one of the devs is a friend of mine
if for some reason you want to use webkit on desktop (linux), there's always gnome web, but in my experience it can't handle anything beyond very basic browsing (for example, a youtube video will cause it to crash)