Three problems with ASICs: (1) Their higher capital cost, limited availability, and limited "appeal" promotes effective centralization of mining. (2) Due to #

Three problems with ASICs: (1) Their higher capital cost, limited availability, and limited "appeal" promotes effective centralization of mining. (2) Due to #1 mining rewards go to fewer an fewer hands, promoting inequality and centralization of wealth. (3) ASICs increase the overall wastefulness of PoW currencies since they're e-waste. Mining ASICs are worthless for any other purpose, while CPU-mineable coins at least promote the production of things that are otherwise useful. If a miner liquidates a bunch of CPUs and GPUs they will see use on the market, while ASICs are junk.