What i half remember is that if the windows installer (or Linux installer for that matter) detects an EFI boot partition, it will write to it, regardless of what the software says it will do, which is why we have to do this.
But once windows is installed and grub uses the chainloader method to pass the boot to windows's bootloader, does that mean that future windows updates will restrict their changes to the windows bootloader? Basically, what risks should I watch out for if Windows is on a drive in the same computer as linux?
I have tried to have separate computers share the same desk, speakers, keyboard, mouse, and dual monitors in the past, but it is not easy or cheap to do well :/