You think you are able to, but you just got lucky so far.
Focus code is very buggy and work for only a few sites. It's very hard to contribute fixes, so I expect it to stagnate even more. And since the sites we, the tech elite, read are similar to the ones the few maintainers do, those will be well served while all the rest of the internet will not see any improvement. IMO it will probably rot away like reader-mode.
Also, it is trivial for publishers to evade it :( just not a effort anyone even bothers with because of the low traffic.
Real firefox for android allows you to install uBlockOrigin. The only actively maintained adblocker that is being gasslighted everywhere. And that you was never allowed to install on IOS devices thanks to Apple the company.
1Blocker in particular has a great UI for homebrew element targeting, while AdGuard Pro supports arbitrary lists and relatively rich blocklist filter rules.
Both are very actively maintained. The innovation from AdGuard is surprisingly rapid, they are not just resting on feature sets from long ago.
Personally, I don't know that that's true. It may be easier for Apple to do it because the ecosystem is more vertically integrated. But that's a coordination problem, not a technical one. I don't think there's a single major player in the Android ecosystem who wouldn't be willing to go along with a plan to lock things down just as far as laws will allow.
I am also weary of giving "random" third parties access to my browsing. I think that my least bad option on iOS is Mullvad, with all blocking turned on. But the bad part there is no browser integration to whitelist sites.
I wonder if it would be possible for Mullvad to present their system as an ad-blocker to Safari, if you are running Mullvad VPN.