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Because it's his computer and if he wants to uninstall absolutely everything but the base operating system, he should have the option to do so.Why do you want to, even? Sounds like a good way to break your windows install for no benefit.
Microsoft designed Edge and its components to be an integral part of the OS making it very hard to "remove". As such, even if you find a way to "remove" it, it will come back during the next major update because the necessary components needed to run the software will be updated and essentially "restored" to running condition as if you never did anything.
Rather than bother with the attempt, I would just remove the icon from the desktop and don't run the program. Set the default web browser to your favorite one and leave it at that. In my opinion, doing anything more than that is a waste of time.
That said, there are other web sites that discuss methods of disabling or uninstalling Edge that you can search for. It gets quite detailed and invasive, so there is a risk of damaging the OS to the point that it no longer works correctly. If you still feel like that risk is worth the effort, I'd recommend following their instructions and joining their forums/message boards to get help.
Because it's his computer and if he wants to uninstall absolutely everything but the base operating system, he should have the option to do so.
Once again, who's computer is it?