There is a real reason various law enforcement agencies have always (past 40 50 years or so) gone with DA revolvers..
There are a NUMBER of reasons, the superiority of reloading speed with the swing out DA gun is just ONE.
And you need to look back further than 40-50 years, more like 100-120 to see the origins of the DA's popularity. Back when officers, and the bad guys, went on foot, or rode horses.
What you see is the guys operating in towns, mostly on foot, preferred lighter guns. City cops, beat cops, walked a lot with their guns. Size & weight does matter. Remember back in those days, the gun was NOT the primary arm of the cop, it was the nightstick, or just their physical power. The .32 was a popular police revolver for city depts. for some time.
Guys that operated in the country, Sheriffs, state patrol troopers, etc, often favored bigger guns. They rode more than they walked a beat. They wanted a gun that would put down a horse, something that was a more common thing for them than for a city beat cop.
Big bore DA revolvers have never been all that common/popular for police, over all. The same caliber SA gun is lighter. And, rapid reloads weren't "on the radar" (because this was well before the invention of radar
)
.32s gave way to .38s, horses to automobiles, and fast reloading, more powerful guns became a more useful thing and even a need. This lead to .38 Special, then later .357Magnum becoming the arm of choice.
This is, of course very general, and is meant to show how the DA's reload speed alone wasn't the only thing considered.