Not really. Windows 8.x requires establishing a Microsoft account for store etc like Google forces same for Android. I find that unnecessary and invasive. Also, if you shut off UAC you cannot USE the stupid Windows store nor update 8.0 to 8.1. Windows 8.x is a mobile platform forced into a computer.
Apart from the fact the Microsoft store is full of crap and useless, there is no requirement to sign up a Microsoft account. You don't need one to have a user account on the computer, you don't need one to get windows updates. You don't NEED one at all. A lot of people already have Microsoft accounts anyway - got a Hotmail address? A store account is not "unnecessary and invasive" it's a store account. Every online store needs an account. You'd better get used to the idea
These days, apart from trying to remove the occasional prompt, I find no reason to disable UAC. You may have some small-time software that doesn't like it, and that's a valid reason to kill it, but for the most part, just leave it alone.