Is it able to use serial console for remote control?
Can it boot non-Linux non-systemd OSes?
Does it handle encrypted disks better than GRUB2 does?
Does it work well if I prefer bios/dos/mbr mode?
Yes, just press 'e' as long as editor=yes in the loader config.
> Can it boot non-Linux non-systemd OSes?
Yes, auto-entries will find Windows automatically and other EFI images can be set up through loader configs. Not sure why it wouldn't work with non-systemd systems considering that's an init system and it's a bootloader.
> Does it handle encrypted disks better than GRUB2 does?
Doesn't the initramfs handle decryption of disks?
> Does it work well if I prefer bios/dos/mbr mode?
No, it doesn't support BIOS boot.
This is also used for boot time or boot repair tools. UEFI shell for example is just another EFI image.
https://superuser.com/questions/1278841/bitlocker-asking-for...
I cant find the reference I'm looking for which was a decent explanation about why the days of traditional style dual booting where the Linux boot loader let's you choose between Linux or Windows using GRUB to choose between Linux and Windows were over, but that question basically covers the same ground.