I'm surprised you don't support them. They would be faster, more secure, no risk of commercial bank failure, and far less privacy (less anonymity). Since all transactions are tracked on a public ledger it would help authorities with controlling illicit activity.
It kinda checks all the boxes, no?
I just don't think it's useful.
Think about the consumers and proponents of the current crypto environment. Those people
want the anonymity of blind transactions between two parties. They would demand a token based retail CBDC. That eliminates the transactions tracked on a public ledger thing.
If people want a digital currency we already have one. It's the USD. So I don't think that it is addressing a need per se.
I think it has a big positive. It could help maintain the dollar as the world's most used currency which helps all of us in the US.
I think it has a nuclear level negative: if the central bank is unable to provide the liquidity required if mass adoption happens and people can't use it, it could literally crater the financial system in ways we've never really considered.
TLDR; I don't think the people that are interested in cryptocurrencies will be interested in CBDC's, and I think the possible mega negatives far outweigh any small benefits from them.