I would say the sandbox limits on the MAS are worse, because they go against what a computer is supposed to do. Limits on the phone are considered ok, because first and foremost, the phone has to operate as a phone.
If I cannot use my computer to give a presentation because some "utility" app is crapping all over other apps because it has free reign of the system, isn't that going against what my computer is supposed to do for me?
The ability for any normal person to identify, understand and resolve issues caused by the wild west of "desktop computing" should be well understood at this point -- they cannot.
The ability for any normal person to identify, understand and resolve issues caused by the wild west of "desktop computing" should be well understood at this point -- they cannot.