> Similar to Windows in a way, it wasn't the best at anything in particular, but had everything you needed, and could be made to do whatever with some effort with the benefit of integration into all of MS's enterprisey stuff by default.

macOS could be better looking and more well-rounded consumer OS but Windows is definitely the best when it comes to providing the most functionally complete APIs. It is also the best when it comes to well-designed future-proof APIs. The backwards compatibility isn't just keeping the functions untouched. It is designing data structures and APIs that can be seamlessly upgraded.

Linux can have DBus etc. but it doesn't go anywhere close to the unified feeling that Win32 and COM APIs provide. Each type of hardware under Linux requires some completely different style (some more functional, some more async, some subsystems are more object-oriented, some APIs are pure text-based the others are IOCtl minefields).

There is a reason CAD software is often Windows-only while many buyers have always been able to buy Macs too (Power, x86 or ARM).