The biggest issue I see is Apple's approach to legacy operating system versions - typically three years at best - and no ability to purchase old versions.
This makes standardization of the platform difficult - i.e. purchasing new devices for replacement or growth may mean different hardware and different software.
On top of that, Apple has a tendency to change development requirements and to require updates to existing apps to meet the latest standards.
In short, Apple's ecosystem in general is not conducive to the needs of businesses, and the iOS ecosystem in particular is entirely intended to be consumer facing.
This makes standardization of the platform difficult - i.e. purchasing new devices for replacement or growth may mean different hardware and different software.
On top of that, Apple has a tendency to change development requirements and to require updates to existing apps to meet the latest standards.
In short, Apple's ecosystem in general is not conducive to the needs of businesses, and the iOS ecosystem in particular is entirely intended to be consumer facing.