Another use is if you don't want to upgrade to the latest firmware, but, want to sync books. The desktop application will download the firmware to the device, but, you can remove the files before ejecting, hence no update. Yes, you can use a patch to prevent the update as well, but, if you are just delaying the inevitable, then this works.
And, even if you rarely use it, it has very low impact. It doesn't associate itself with anything, it doesn't try to start when you connect the device, it is only active when you start it and there is no communication with Kobo if it isn't running. The only impact is the space it takes for itself and the books and an icon somewhere on the desktop or in the menus.
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