This might not be an issue for default apps, but there was a time when websites and toolbars abused setting the default homepage, so I have mixed feelings about

This might not be an issue for default apps, but there was a time when websites and toolbars abused setting the default homepage, so I have mixed feelings about this. It also improves the user experience if you use two browsers because when Chrome reminds me it's not the default, it's harder to accidentally make it the default.