Why do Adobe Reader updates insist on putting a shortcut on my desktop
Some people may want one. Whether you right click and move it to the recycle bin or have to opt out of having on during the update, it'd be about the same amount of work.
Come to that, why does anyone need one anyway if all you have is reader? I never open a .pdf document by opening reader first, I just click on the document.
Everyone doesn't work the same way. Maybe they want to open Reader and look for recent documents. Hard to say.
I always open the Reader from the desktop shortcut.
However, I agree that the user should be given a choice. Voice your opinion at https://www.adobe.com/cfusion/mmform/index.cfm?name=wishform