CHIA mining can also be decentralized, because according to the miners there is now a huge payback period for equipment that exceeds the average life of hard drives. If this coin becomes popular, then it will be captured by centralized pools very quickly.
I just hope centralized pools don't take over the HDD mining industry, as that would make it much harder for the average Joe to mine at home using their old drives. Pools would effectively make solo mining pointless. We're going to have to see if developers are willing to make decentralized solutions such as P2Pool and Betterhash work on HDD-mineable coins like CHIA and BURST. But I doubt they will do anything about it, since HDD-mineable coins aren't that popular on the market. I've read something about "mineable tokens" on the ETH blockchain (eg: 0xBitcoin), so maybe we'll see HDD-mineable tokens built on ETH soon.
At least, we aren't stuck with just GPU, ASIC, CPU, and FPGA mining. As long as there are many options to choose from, nothing else matters. Just my thoughts