What exactly is the benefit over Waterfox or Ungoogled Chromium here? The FAQ https://kagi.com/orion/faq.html#firefox seems to be things that are specific to Mac or have privacy features already offered by open-source alternatives.
Fwiw, it's a webkit-based browser. Another alternative browser engine in a usable browser is a plus for the Ecosystem.
On the other hand, it promises to be a simple yet usable (builtin adblock + privacy) browser. Ime, brave is probably the closest however it has a lot of nagging around their crypto and ads.
No, it doesn't. Sorry, my comment was not worded clearly there. The nagging around crypto and ads on the homepage are a (anti-)feature of brave (that don't exist in Orion).
For the Mac version, one of the “features” is that it’s built with the native UI toolkit and tries to blend into the desktop instead of setting itself apart with “branded UI” like browsers tend to do these days. Presumably the Linux version (which I’m assuming is built with GTK) would similarly adhere to GTK desktop (mostly GNOME) conventions.
GNOME Web is extremely barebones, moreso than even Safari (which itself is pretty basic). On macOS, Orion kind of acts like a “Safari Pro” with a whole bunch of power user features like vertical tree-style tabs and profiles among many other things. I’d expect that under GNOME, Orion will be a power user oriented “GNOME Web Pro”.