Out of interest, how does Win 10 compare with Mac OSX in terms of being able to install and change default browser?
Given Apple's penchant for lock down, I'd expect it's much the same as Windows?
OSX has always worked as Windows 8.1 and below did with browsers - the browser pops up and asks if it can be the default and you say either "yes" or "leave me alone."
Windows 10 has made that a multi-step process, where the browser now bounces you to the control panel where you have to find the default browser section and make your choice.