What spec would that be? BM and MM seem to cover most hunters archetypes and if you don’t enjoy those then why even play hunter?
Obviously a very difficult class with a crap ton of buttons and almost no group PvE utility is going to be played less… Unless their damage is insane (and if their damage was insane people would complain to high heaven, and the loudest would be hunters “forced” into the spec). Blizzard knew what they were making. Survival was the PvP tree for the longest time and they wanted to go back to that. Tons of utility, tons of tricks, but harder to play and mixing melee and ranged.