I’ve considered switching to Safari on my Mac because I had heard that it has stellar performance. However, with no support for uBlock Origin because of their incomplete implementation of the extensions API, and now these UI changes, it looks like I’ll stick with Firefox.

I still plan to stay with my Mac because of the ecosystem. I’m one of the few who seems to actually like Windows 10. There are warts in Microsoft’s software, just as there are in Apple’s. But I like having my iPhone integrated with my Mac. The only option on Windows is Android phone integration. I’m trying to remove myself from Google’s ecosystem, though.

Adguard is 99% the same, and free, and on iOS.

Adguard is NOT free. Beyond that, it is the worst plague of the modern computing age - subscription.

An ad blocker has access to extremely invasive data and Adblock wants me to pay them a subscription so they can get my PII and associate it with my browsing?

It is also not Open Source so I can't rely on the hope that someone smarter than me would have caught its dirty tricks.

I use Safari for a tiny subset of my browsing due to this gaping hole...

Adguard for Safari is both free and open source

https://github.com/AdguardTeam/AdGuardForSafari