Sort of makes you wonder why automatic pistol design evolution included the retrograde step of DA?
The Webley Fosberry came out two years after the Borchardt, and predates the Mauser Broomhandle by a year. Trench combat was almost 20 years out. Considering the target grade accuracy, the Webley Fosberry wasn't a terrible choice at the time.
Adding a DA first-shot mode to an otherwise SA automatic pistol was a purpose-designed safety feature as a hedge against the negligent operator