You can actually dual boot just fine on a single drive. We used to TRIPLE boot Mac/Linux/Windows!
It was way more of a hassle back in the non-EFI days where you could only have one bootloader per disk. These days they don't clobber each other.
-- Frost
Counterpoint: Choice is good. Let's not try to impose some Single Standard™ on everything, thanks.
Just like programs not written in Rust are okay, good, and important to exist.
Just like non-systemd init systems are good.
And having multiple options for DEs.
Choice is why a lot of us are even here.
-- Frost