In the case of most cryptocurrencies, many people don’t think twice about what CPUs to get for their rig. Why even bother? Who would even plan to mine on a CPU? For most cryptocurrencies, the cost outweighs the meager benefits. People usually just buy a dirt cheap processor that’ll support multiple GPUs and that’s it.
With the current price of Ethereum, many crypto-newcomers are keen to jump on the mining bandwagon using their own machines. Although it’s technically possible to do this with your home or office machine, the question of whether ETH can be mined with a CPU is secondary to the question about whether you can do so