I feel like this has probably been raised before, since Legion it’s kind of been an arbitrary and artificial blocker to have the Legion Class Mounts locked behind a spec-specific colorization.
Not all mounts from this era adhere to this logic either, paladins, warlocks and rogues, for example get all colorations regardless of their spec.
I hope that in Dragonflight we can see the other skins added to the class order hall quartermaster or something.
The reason I flagged this to begin with is that I saw that the DK class order mount was amongst those lucky enough to be blessed with dynamic flying animations, I hope that I can one day use the frost skin variant (playing as unholy) without having to swap specs and otherwise change my gameplay experience just to use a mount that I cosmetically prefer, I’m sure others would like to use a color variant outside of their spec for Xmog purposes also.
Rant over - more just feedback.