IMHO, the OS's work very well, considering they were designed and built by humans, to be used by humans for many tasks. Windows, et. al., is a far more complex beast than any OS on the planet.
Granted, some things are left 'as is', so there is a third party after market. Does your DJ company provide limos, cakes, flowers, video, photo, food, tablecloths, etc.?
I use the standard Windows firewall on my stuff, and Norton. That's it for after market security. Works well.
I would think the user community has the inherent flaws -- in that they should probably reconsider visiting certain websites, opening certain emails, loading certain software -- and that should be addressed before worrying about Window's phoning home to the Mother Ship
Think of it this way: If you saw somebody breaking into your trailer to steal your equipment, you would probably take some action I think. Software is just equipment on a different level, so manufacturers are taking action.
Just my .002