Cbdcs are from the head of the banking system. Regional banks don't like big banks but have to comply, if anything small banks are way more friendly to the average person and their interests.
Without cbdcs no one can tell you what you can or can't spend your money on. With cbdcs linked with digital IDs, they can, and they can punish you if you aren't complying in any way.
Convenience is their justification, but the expense is never mentioned by them.