My issue w/ a hammer fired pistol is the matter of decocking. I have seen more than one trained person, who darn well knew better, do some stupid/dangerous things with a cocked DA/SA pistol under stress.
So....a DAO pistol would solve that. But I have not handled any DAO pistols with triggers that compare to a stock standard striiker fired Glock.
Any big PD using Glocks, is training rookies with the striker system, and many officers are not gun fans in the big metro PD's.