Indeed, first of all Apple might not be around any longer, without the reverse acquisition played by Jobs, who knows how well BeOS inspired Mac OS would turn out.
There would be no iPod taking Apple out of red zone.
There wouldn't be FOSS devs flocking into Apple hardware as replacement to sponsor Linux OEMs instead.
And it would be yet another C++ focused desktop operating system, assuming Apple would survive the transition in this alternative reality.
Due to a serious of steps where Copland failed to deliver, Gasse wanting too much money, NeXT being acquired into what turned out to be a reverse acquisition.
And every HomePod, Apple Watch, iPad and Apple Vision Pro. Plus the later Apple TVs. I think even some of their newer displays have the OS in there too.