I care because I am a Windows user. Just because the other guys have them as well still doesn't make it right. I disagree with it all around from every tech company.
As far as I am concerned it is the same thing. They have the potential to steal anything and get away with it. Any papers, patents, copyrights, or schematics you might be in the process of working on could be stolen and finished and registered before you get around to it. That's just the start. The access is two-way so placing illegal files on a 'Needs Work' journalists' computer in order to discredit them and get them fired is not impossible. I am sure that the NSA would pay them to do this to many people.
Flat out. The only way to eliminate the possibility for this to go wong is to get rid it. My questions regarding ESS still have not been answered.