Not sure how exaggerated this is, but even then, those vendor can very well have the bad idea to don't give a shit about compat between one chip and its next version. Given where there go and the associated ecosystem, I suspect they do exactly that...
And then on PC too, you pretty much only have competition on the surface; then it's Intel and AMD. Given how modern CPU are SOC (and chipsets are now paired with CPUs, and with no 3rd party licence anymore), you have almost all of what matter in your system (for system compat) there...
And then on PC too, you pretty much only have competition on the surface; then it's Intel and AMD. Given how modern CPU are SOC (and chipsets are now paired with CPUs, and with no 3rd party licence anymore), you have almost all of what matter in your system (for system compat) there...