This is why elite units are elite. It's a combo of constant training, repetition, and mindset.
I think a major issue is loss of manpower now though. This can be a chicken or the egg debate, but with the defund the police movement, there are less and less people willing to start a LEO career, and many veteran officers are turning in earlier than they would have. You still have to have patrol officers on the streets and most departments are already getting stretched thin. It's not always feasible, or safe for the public, to schedule a heavy training load for patrol officers who already completed their basic FTO.