Why not to add a 'slow' CPU mining option to the full-node software?
Am I missing something here?
First of all, how would consensus work when are 2 different PoW (SHA-256 and other algorithm for CPU) on the network?
Additionally when it comes to doing work we have no way of distinguishing what hardware was used to perform that work. In other words someone could build a new ASIC to mine the new "slow CPU mining option" and we would be right back where we started.
Even without ASIC, someone could simply build CPU farm (just like miner build GPU farm). Besides, used CPU/server rack sometimes could be found really cheap on online shop.