Druids are ideal in many ways for HC, if the numbers really indicate very low Druid numbers I’m not sure why beyond the lingering prejudices from pre 1.12 Vanilla.
Ferals have low gear requirements to perform well, definitely a plus for HC with daily dungeon lockouts. You touched on movement speed increase which should not be underestimated. They are almost unkillable outdoor by appropriate level mobs given their toolset.
I am encountering some ignorance of the class among other players in HC, ranging from pre-1.12 outdated impressions to conflating classic Druid gearing with that for TBC.