What Microsoft does is tie into the OS, you can take out Flock out of PC/OS and use Firefox or Opera and even Google Chrome when it becomes available for Linux. Can you take out IE? Look at everything Microsoft gets in trouble for and can you take that out
of the system? No. You can add apps, you can take apps away but not the Microsoft preinstalled stuff.
To be honest, I've never really seen the problem with not being able to remove stuff; it's never stopped me using FireFox, or QuickTime or anything else.
But good luck with the PyStar stuff; anything that helps them is all good in my opinion.