That's the REAL reason the FBI dropped it and went back to the 9mm. They are hiring too many folks who've never fired a handgun until joining and they can't take the recoil.
I've never been all that impressed by the FBI. Most of the agents I knew were legends in their own mind...

And as far as the agency's choice of handgun calibers go, they jump around more on what they consider the perfect caliber then I swapped perfect girlfriends back in the day!

Remember the 10mm?
Believe me, I could go on and on about FBI's "policies" as well as the other agencies/departments that take anything the FBI says as if it came down from the Mount.

I'm old and worn out, 80 now, and my hands are eat up with arthritis. I can't take the recoil of it in a S&W Shield, ... Recoil from it is sharp, more so than the .45 acp... I like it better than the 9mm or the .45acp as a defense gun.
Well, I'll be 80 next month but fortunately (?) the arthur is/was relegated to my hips.

Which means I have to stand and fight should the need arise!

Fortunately I never considered the recoil from the .45 Shield that bad. Nor any of the 9mm's with the latest hot SD loads. Maybe I'll rent a .40 at the gun club just the have something as a base line.

But tell me, if you don't mind, why do you prefer the 40 over the 45?
I remember the days when rookie cops lasted 3 or 4 days on the street, and quit when they found out that not everyone was afraid of the cops, nor respected that badge. If you ever backed down, everyone in the county knew about it in a week, and your career was over.
Amen!

Made me remember when I first got on the street. As a rookie roustabout my Lt. or Sgt. would consistently assign me to the worst beats in the City. Usually the ones containing at least one housing project.

Learned a lot about big city policing and I never felt outgunned... at first!