Because Hellbats are a terrible unit to add in most Bio compositions.
- Bio usually relies on its mobility to kite and avoid splash damage. Hellbats are too slow for that.
- Every source of splash damage that is strong against Marines (Disruptors, Colossus, Storms, Banelings, Siege Tanks, etc) is also strong against Hellbats–sometimes even stronger because of the Hellbat’s slow speed.
That is to say, Hellbats provide no advantage to Bio, they are usually a hindrance. Even if Hellbats were guaranteed to have equal or better upgrades to Bio, they simply would not be worth using.
Hellbats have 9-10.5 DPS (normal speed, multiply by 1.4x for faster speed) against non-light units with splash. That is a decent amount of DPS for a 2-supply unit.
For comparison:
- It is more DPS than a stimmed Marauder has against non-armored units.
- It is more DPS than a Hellion has against light units.
- It is only slightly less DPS than a Stalker has against armored units.
Hellbats can consistently hit 2 or more units in most cases, so their actual DPS ends up being much higher than normal for a 2-supply unit.
This is balanced out by the fact that Hellbats have short range and slow movement speed (so they deal damage late or can be kited), but that’s why you use them with Siege Tanks that will punish the opponent for trying to keep their distance.
Secondly: Archons cannot ignore Hellbats as long as the Hellbats are still alive. Hellbats are large and tend to be present in large enough numbers that the opponent cannot get around them.
MyOhMind does have a point that Hellbats would perform better against Protoss (at least Protoss compositions with Archons) if they didn’t have a Biological tag.
Medivacs are rarely used in mech; whereas Archons are regularly used against it.
So yes, there is a strong case to be made that Hellbats would perform better specifically in TvP if they didn’t have the Bio tag.
That is only true in TvZ, and the Hellions are not likely to last long enough to be turned into Hellbats or used that way.
Without Medivacs, so the Bio tag and healing still don’t apply.
Medivacs are rarely used in mech even for drops, so MyOhMind is still correct here.
Removing the Bio tag would have a greater beneficial effect in TvP than it would have a negative effect in any other match-up.