If it works, what is the problem? If we have a 20% hit rate and a 99% (rates for example purposes only) win rate, I don't see the problem if our concern is with winning the gunfight. That does not mean I'm an advocate of the status quo, BTW. The status quo comes in many parts. Some I support, some I advocate, some I'm against.
For the assumption that winning the gunfight is paramount (and it
will be to the officer(s) involved) if a 20% hit rate works, that's fine. From a different view, the question is how much of a danger the 80% miss-rate presents to the public.
I'll grant you, that during any event in which someone is trying to kill you, your primary focus is to win the fight. Scant thought goes to worrying about where a missed shot went when bullets are whizzing past your ear and sparking off the car's A-pillar or you're dodging a fire axe. But that doesn't mean we should not strive to find ways to improve the hit rate.
There is also the disparity between a miss by the police and a miss by a civilian to consider. We all know liability is attached to every bullet. But police are typically shielded by government agencies and statues while civilians are on their own.
The best example of that comes from an instructor friend of mine in Nevada. One of his students found himself being waylaid in a Las Vegas parking garage by two thugs with aluminum bats. He was hit twice by surprise, one hit breaking his left arm. He fired 4 shots from his .40 Firestar. Two shots drilled the larger man c.o.m. and his 3rd shot, from a supine position between cars, struck perp #2 in the right knee. The 4th shot grazed the prep's side and shattered the window of a Toyota SUV two aisles away. A police sergeant who talked to him in the hospital subjected him to a 30 minute lecture on his liability for that one missed shot, that there were dozens of others in the garage that he "put in danger", he could lose his permit, etc. etc. He was eventually cleared. That same sergeant was involved in a violent car stop some months later. In that incident, he fired 11 rounds. Two hits put the suspect down, but 3 of the remaining 9 shots struck vehicles parked in a nearby day-care center about 80 yards away. A press statement by the agency said their officer "did everything right". One can only hope he got the same lecture he gave.
Unfortunately, government budgets being what they are, we are unlikely to see training programs that teach shooting at moving targets or how to shoot well while moving.