It will be worse to people on UEFI.
But see this website on bios-legacy.
Need to put in /etc/default/grub
sudo grub2-mkconfig -o /boot/grub2/grub.cfg
As for UEFI, and as I mentioned earlier,
there is another grub.cfg generated in $esp and moving all the grub and kernel things to it.
I suspect that as Fedora is moving people towards systemd-boot, they are making those using grub towards having kernels and grub to its $esp and later on make that /boot rather than /boot/efi, and migrate to systemd-boot.
There's nothing wrong with systemd-boot. In fact, I think it better than rEFInd, but not for multi-OS's users like you and I. With one OS, I think it is superb.
Anyway, I personally think linux OS's that mess up other linux OS's are conceited. It is not as if they are offering an alternative choice. Its okay to have their own package manager or change DE preferences but making common shared packages incompatible or broken is wrong. Like windows thinking they own our computer.