It can be. I'm surprised after years of MS saying "IE is old and s*it and will be going away, you should stop using it" that when they do finally get rid of it, they immediately bring it back as IEmode inside Edge.
In that case, wouldn't it have been safer to keep iexplore.exe so that people who have dumped IE don't have to worry about hackers trying to "trick" msedge.exe into running dodgy websites in IEmode?