The Walled-Garden Approach

As more of our computing ecosystems move toward a walled-garden approach. What do you believe we will miss the most from the way our current systems work? What do you believe will be our greatest benefit from this "new" philosophy?

My two cents would be the ability to load different OS's onto our hardware that we purchased. I love the ability to load Windows and Linux onto a new machine. But I do not get the option with Android and Windows Phone. I did not note OS X and iOS because they never have been able to, and never will be able to. Bootcamp is an exemption.

I do believe that the walled garden approach will grant a uniform performance expectation as opposed to what Windows systems have shown in the past. Granted Windows is not the prime example of a open-platform but it is what most people have been exposed to.