Microsoft is taking some serious steps with their Chromium based Edge browser. First, it will be auto installed with an update to Windows 10. Second, talk is that you will not be able to uninstall it even if you want to.
Now we have 100 crores ( 1 billion ) Windows 10 devices in play and you are a developer who works with web apps. How prudent will it be to ignore the default browser in Windows 10 ?