Personal devices shouldn't be used for work purposes to begin with. If work has security requirements regarding what phone and what condition it is in, they better be supplying their own phone to ensure those requirements are satisfied.
No, they don't benefit (cause it means they check work mail on weekends or evenings), but their employer do...
> Moreover, because iOS apps are sandboxed, as implemented in other jurisdictions, apps available through alternative distribution will be sandboxed, which further strengthens security and reduces the likelihood that any app will compromise other apps [...]
On the contrary, it allows app and payment security to be better than what Apple offers.