I used to be a Mac developer. The first company I founded developed software for the Mac. I have no particular complaints with OS X or the Mac GUI. However, with the advent of Tim Cook, Apple became a consumer electronics, not a computer, vendor. The lack of investment in the Macintosh and OS X was painful to watch as the Mac lost its edge and lived off its past glories.
I'm hopeful that the M1 signals the Mac's return to the big time. Not only is its architecture elegant and its price/performance exceptional, but the software migration path looks well thought out and eminently practical for software vendors. This looks a whole lot more doable than the 68000 to PowerPC to Intel migrations I lived through.
It would be great if Apple directed sufficient development resources to OS X to truly exploit the M1 (and M2 ...) architecture and performance. Now that would be something!