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That’s spanning decades. The current lineup is highly consistent: macOS, iPadOS (I don’t think Apple uses a space here), tvOS, watchOS, audioOS all use product categoryOS.

homeOS doesn’t exist yet for the public, does it?

The only outlier is iOS, which should have been called phoneOS or iPhoneOS.

Why is naming an OS differently when it is actually a different OS with shared features?

What are the differences between OS X El Capitan and macOS Sierra?

You listed a bunch of OS’s for other hardware.

iPads used to run iOS now they run on iPadOS.

It just feels so far from Steve Jobs 2x2 grid of products.

Because the iPad has always had a different gesture set than the iPhone.

What, no A/UX or Mach?

https://en.wikipedia.org/wiki/A/UX

https://en.wikipedia.org/wiki/Mach_(kernel)

Hey, you should pick up some carrier-grade Cisco routers and switches, and run IOS to tie 'em all together!

https://en.wikipedia.org/wiki/Cisco_IOS