Maybe not that much more complicated, but it does give a less experienced user a lot more opportunities to make a mistake that could result in data loss or just a computer that suddenly decides not to boot Linux anymore since a Windows update broke grub.
This guy isn’t kidding about the garage door springs. I had some of the old style ones in my old garage that broke and launched a piece of metal across the garage right past my head and made a giant dent in a 2x4. Those things are vicious.