uBlock Origin is not available for Safari in its original form. It only exists as a (somewhat neutered) fork that's basically dead[0].
There's a disconnect in the sense that a lot of people think that adblocking in Safari is fine, even though it is pretty objectively less capable than Firefox/Chrome in this area right now. There's no disconnect in saying that Manifest v3 is going to hurt adblockers, because the same changes in Safari also hurt adblockers, and (as of last time I checked) Chrome's proposed changes go even farther than Safari's did.
But in general, yes, you should already be avoiding Safari today if you want to use the best adblockers on the market. Safari suffers from the exact same problems, that's why I use Firefox even when I'm on a Mac -- because the adblockers and security extensions for Firefox are just a lot better.
