I totally understand the argument that (c) is more objectionable since the chip you buy is prevented from using all the elements it left the factory with. However I think it really shouldn't feel different than (b)? The only difference between getting 8 core part with 8 more cores burned out on its way out the door and an 8 core part with 8 more cores disabled in microcode is that you can double the core count of the latter in place for a price that's presumably proportional to the price difference between the 8c and 16c SKU?
Of course there's a slippery slope to a hardware-as-a-service pay-us-x-per-unit-time-or-we-turn-off-your-CPU, but with competition from AMD on x86 and in-house ARM chips from Apple and hyper-scalers, one would think Intel wouldn't want to make their product even _less_ attractive.