I came across this question on Ask Fedora:
https://ask.fedoraproject.org/t/problems-making-dual-boot-fedora-w10/10766
where the person is having trouble getting Fedora Workstation set up for a
dual-boot-with-windows-10 environment.
There's a paradox or irony here: this is one of the most complicated things
we might ask completely new users to do, yet also, new users just dipping
their toes are probably most likely to want the comfort of being able to
boot back to their old OS.
Do we have better hand-holding instructions for doing this somewhere that I
could point this user to and which we could make more prominent?
I am not a bootloader/installer or UX expert, so maybe take my two cents with a grain of salt.
Can't we have a button or dialog window offering "Install side by side with Windows" to users installing Fedora somewhere where there is WIndows already (or other Linux, but that might be more problematic)?
That could automagically mount the ESP, shrink Windows part (so the dialog can contain a slider)...
That would definitely lower a bar for novice users. Also, from what I remember, this sort of stuff should be safer on UEFI/GPT machines, so the dialog can show just there?