Apple's Safari is unfortunately not keeping away the Web from being a Chrome monoculture.
Lots and lots of Web development projects target Chrome, then make sure it works on Safari. In that second step, they accidentally fix a lot of bugs that'd show up on Firefox, too.
Not a lot of them are bothering to check Firefox directly these days. Hell, a decade ago it wasn't making the test list in tons of cases.
Soon as this happens, Chrome is the web. The OWA knows this, it's their goal, it's an astroturf outfit.
Ideally, Google will be broken up and forced to divest Chrome (this is in progress, but at the speed of the US federal government, so could be a decade if it succeeds), and then we can require Apple to remove their browser ban. Doing this out of order will destroy the web as we know it.
If Safari were more competitive, more people would use it.
I'm not a Mac user, but I wish I had Safari on desktop as an option today.
Webkit browsers do exist on other platforms. They're far and away the best-performing sorts of actually-usable (in terms of supported Web features and ability to render real pages in the wild—sure, lynx works, but...) browsers on low-end machines, should you have to use one, to the point that they may be viable on a machine that's otherwise basically incapable of using the modern Web at all (which confirms for me that there's some fundamental, deep-down plumbing reasons behind why Safari's so much better on battery life than Firefox or Chrome-based browsers)
None of them are Safari and I can't vouch for how they are as daily drivers long-term, but it's nice to have one semi-up-to-date engine around that still kinda works on bad hardware (and by "bad" I mean still several times stronger than my workhorse many-tabs-browsing multi-tasking machine circa 2003—you'd be amazed how strong a machine has to be these days before trying to use the Web at-all normally in Chrome or Firefox is anything but terribly painful).