Not allowing choke holds isn't superficial. Body cams aren't superficial. They cut down on police use of force and citizen complaints. They also cost money. Better trained police costs money. Sending out social workers with police on domestic calls costs money ,and makes a huge difference in the quality of policing.

The only substantial reduction in policing cost is cutting back on the drug war and most left leaning states are doing that. (Reducing numbers of police would do it but most states have similar per capita number of police as Europe).

There is no doubt we have a long way to go on police reform, but to say there has been no progress simply isn't true.