Additional to that account thing: Why does one have to install an app in order to access all functions and to toggle options of a device?
My girlfriend once has bought new headphones. In order to switch off the telephone function (you can - among other things -answer calls from the connected smartphone by touching one side of the headphones) it is required to download an app (a sloppily programmed one as well) to switch off this specific function. All other functions (volume, play, back and forward) are operated with buttons.
I heard about the same thing but with printers: The scan settings can only be toggled by an app (I think it was HP who has that feature - who else!?)
Because it's cheaper that way. They already have your money and have shipped a product with the promised features. So it doesn't matter that the functionality sucks.