I think you are over-estimating the quality of their software engineering. Maybe ten years ago I would have believed this, but with each macOS release the litany of unforced errors just continues to grow. The advantage Apple derives from owning the whole stack is a bit oversold, at least when it comes to their non-iOS products.
Of course this is anecdotal, but my macbook (made solely from Apple-supplied parts) seems to crash 3x as often as my cobbled-together-from-spare-parts Windows 10 desktop.
> Otherwise, they simply won't release it at all.
Do you think post-Jobs Apple retains that discipline? I'm not sure.