Is it bravery when you have no other choice? Microsoft is trying to "make the PC great again" because everything else they tried has failed. If the "Windows workstation" (oxymoron alert, I know, but it is the best way to think about PC vs smart devices) goes down, Microsoft goes down.
Compared to this amount of existential dependency, Apple continuing the Mac line is more like when Microsoft was still continuing their Flight Simulator despite already chasing much bigger prey in computer entertainment with the Xbox division.
If you're a student of - particularly - the last 50 years of tech industry history, then you understand there is always another choice: established tech companies have frequently chosen to stubbornly die off tightly clinging to their own past, rather than attempt something else. Microsoft was previously well on its way to that land of eroded or dead tech giants.
Compared to this amount of existential dependency, Apple continuing the Mac line is more like when Microsoft was still continuing their Flight Simulator despite already chasing much bigger prey in computer entertainment with the Xbox division.