Just imagine what Apple would do to the market if they also offered a full Linux support, but not Windows... They'd probably own some 70% of Linux market outright and also double its overall size overnight.
Suddenly you could have a Unix, with pretty much the same CLI as Linux but without all the supported hardware/driver issues. Laptop sleep in particular was pretty finicky.
If MacOS didn't pick a Unix/BSD base, I'm pretty sure all the tech companies running Mac would be on Linux.
FoxTrot comic from 2002:
* https://archive.is/https://www.gocomics.com/foxtrot/2002/02/...
<cough> xattr...
I would argue that things have changed significantly since then.
> Reception was mixed, focusing on the difficult installation process and the significant performance costs of the Mach kernel. Reviewers noted its potential as a "Unix killer", but that it required users to abandon the user-friendly Macintosh experience for a pure Linux environment.
So it was a failure in implementation.
I'm sure if Apple provided support for installing your own OS on their M series laptops it would be incredibly popular. And I don't need to guess at this using weird 1996 research on microkernels because Asahi Linux exists and clearly there is interest in it.
We don't need research because QNX, L4 and many others on embedded space do exist as well.
Apple was not a bastion of quality in the 90's. They couldn't modernize the Mac OS, and that continued with little more than window dressing over what was released in the 80's. The Mac line up was a horrible mess of barely different models that needed a Ph.D to figure out what was different. The company was bleeding money and seriously close to bankruptcy.
The Apple of the mid 90's wishes it could release something like Tahoe.
OS 8 was a platinum theme over System 7. Which was a slightly better System 6, which wasn't significantly different than System 4.
System 7 was good for the time, OS 8 and 9 were not, and Apples inability to improve the OS were really starting to show. Windows 95 was a more stable OS than OS 8. Tahoe is better.
Not to mention that the OS itself was still mostly 68K emulated code even on PPC Macs and holding the mouse down over the menu caused all apps to stop running.