'use software RAID' is a misleadingly vague statement of the problem
It's disingenuous of you to accuse me of being misleadingly vague when the very sentence [that you fail to quote] says " if you do something bizarre, like mirror your drives". It's clearly qualified - blame shifting is not becoming. The ironic 'bizarre' is there to indicate just how common this configuration is.
Yes, /boot is mirrored on mirrored drives, just like /, /home, /var, etc.. Every server I've ever seen with mirrored drives has /boot mirrored because if one drive fails you still need to boot (which is why one mirrors drives in the first place).
The Fedora Project empirically doesn't care about this incredibly common use case in the server world. I see from the release notes that most Fedora installs never even need an MTA, so I'm guessing desktops on SSD's are now the current focus.