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Because that's not Apple's business model? They did the licensing thing in the mid-90s. Mac clones were a thing. To license macOS means to support infinite hardware variations, and to rely on OEMs not to suck. It is an impossible technical problem for a company whose whole ethos revolves around integration of h/w and s/w.
To license macOS means to support infinite hardware variations, and to rely on OEMs not to suck. Kind of. Apple had to approve any clone designs. It wasn't as willy-nilly as the PC market. At the time Apple allowed cloning, Apple itself had a large number of varying models to support. Apple's big problem was that the clones were faster and cheaper. For example, the Umax C500 was available up to 240 Mhz while the Powe…
Plus, we are in a different world these days. Intel hardware, due to Intel's keeping the bus proprietary and getting rid of the chipset makers, is a lot more generic than back in the day. NeXT and a lot of open source projects today have a list of hardware you can use. The list for today is a lot shorter. I think a lot of companies would thrive on making good macOS machines.
I really think Apple should just stop making any PC other than the MacBook and iMac lines. That's where their heart is anyway. License the OS for $250 a pop and sell for the same. If they are that concerned about what happened before, limit the sold macOS to Xeon cpus only. That will get rid of all the portables that might reduce their MacBook sales.