Anecdotally, the niche it solved for me for a while was "Safari for optimal performance on mac, but with proper extensions like ublock".

I used it regularly for almost a year, eventually got off because of some UI bugs that came up and because the Safari dev tools feel so clunky/need relearning compared to Chrome & FF.

I’ve been using it on iOS since it’s near inception and I can report that it is much more stable now than it was since its original release. I tried to live on the desktop browser, however, and eventually had to declare it unusable and switch back to Firefox. Mostly around things like 1Password and similar extensions being pretty broken in the Orion desktop browser.