Indeed, Apple from 1996 would not released Tahoe, most likely.
We don't need research because QNX, L4 and many others on embedded space do exist as well.
Apple circa 1996 would be charging for its updates and licensing out the software to Power Computing and UMAX. They were making a lot of "interesting" decisions.
Rip Blackberry Phone + QNX, you were so promising for such a short time.
Do you forget what Apple in '96 was? Or are you saying that Tahoe is too polished for the Apple of '96?
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.