Balance
The reasons a company needs to provide standardised IT has several explanations. Buying standard kit provides cost benefits if the procurement deal is setup correctly. It also allows the deployment of a standard build - this makes sure subsequent troubleshooting is simplified by having a common stack deployed.
It also ensures the 'standard' software stack as defined by policy is applied to all deployed IT - anti-virus, software required to complete common tasks, audit/compliance tools. It also allows restrictions to be applied - such as preventing data from being copied off unencrypted to portable data devices that can be lost or stolen.This can look draconian - however, if you take a step back, it's not just dogma and belligerence at play when these systems for IT are in place.
What happens however, is that people get excited by the new toys on the block - tablets, smart phones etc - that have features that are 'missing' from the standard IT deployment - like the ability to have portability, or touch screens, or apps that are disallowed by 'corporate standard'.
The solution to this is not 'BYOD and secure it' - the solution is to look at what the user community wants and what they are solving using their own IT devices, and see if there is a secure, compliant, non-draconian option for providing this instead.
Both solutions - BYOD or offering more 'flexibility' to user IT - comes at a cost, due to increased security infrastructure, testing and support required.
In addition to this, BYOD often comes with fewer restrictions over using 'the cloud' and external applications - there are often very limited alternatives that the corporate IT provide.
For examples:
BYOD user - "I want to share documents easily and globally so I use Dropbox". Corporate IT response - "Have you tried our file server or sharepoint which is only accessible if you are local on our network and you have permissions in place"
BYOD user - "I want to video chat with an external client, so I use Skype" - Corporate IT response - "Have you tried using the internal chat tool with no video that also can't connect to clients"
If the IT department doesn't respond to the needs of the business and users, then it's not surprising it finds itself side-lined and circumvented.