Only because they started out with a deadzone.
Now, they easily could have made melee-weaving more productive, but that clearly didn’t seem to have been a featural goal, only ever perhaps an oversight.
Obviously, I enjoy having reasons to go in, because I like contextual complexity and it’s a damn quick way to get that, but it was primarily a downtime-supplementary feature, just like being able to use Arcane Shot and Steady Shot on SV now would be, or at most a way to apply a finishing blow in leveling or while needing to move past the mob anyways.
That’s also true for more classes than not, though. Out of all classes with multiple DPS specs, only Warlock and Mage do not have that problem. Frost DKs have traditionally suffered for using two-handers, if even allowed to do so, Fury uniquely takes up twice the weapon slot value and upgrade costs of any other spec in the game (unless SMF is balanced), Enhance and Feral use different weapons from Elemental and Balance, etc.
Neither do the other two specs. Which is to be expected, when those are, outside of healing specs on hybrids, all class utilities rather than spec utilities.
If there is to a Hunter spec that uniquely brings raid utility to the table, yes, it should probably be SV, but as it’s not a healer, there’s no reason to expect it to bring spec-unique raid support.
At least one spec that is raid viable.
And Feral is presently viable.
We shouldn’t be conflating “raid buffs” as all the same thing.
The “raid buffs” Rogues bring are rather different from, say, Battle Shout. Give Hunter an equivalent of the latter, and you’re that much more likely to cap raids at a single Hunter once that rDPS is balanced against (siphoned from) their personal output. Give them stackable/syncable utility like Rallying Cry, on the other hand, and you may have a reason to take multiple.
Sidenote:
Marksman has the highest average performance of any Hunter spec, by a pretty large margin. On all but 3 fights, it is the highest performer.
Why are there only three times as many parses by MM, the best performing spec, as the typically lower-performing SV, who allegedly has “no” players?