IMO, I think that the Tyre Nichols situation showed that the 'felony cops' (aka cops 'trained' to handle tough situations) is typically a terrible idea that leads to terrible policing.
From my perspective, regardless of how you split the existing police force, at the end of the day the only approach they have is be able to lock up people when they do something wrong. If the only tool you have is a hammer, everything looks like a nail.
The purpose of a social worker is to try to deescalate but also work to reach a resolution so that ideally they interact less w/ the police over time.
Somewhat related, but I think that they should be hired outside of the police force. We couldn't even trust the police review board w/ the Laquan McDonald case so I doubt social workers would be as neutral/effective if they were recruited by the CPD