Hydralisks and roaches

Was a mistake the fact that hydralisks of SC2 have not acid saliva attack as in SC1 anymore?
and, was a mistake that in SC2 the roaches have the acid saliva instead of hydralisks ?
because i would like the spines for roaches and let to preserve the acid saliva for hydralisks just like in SC1 was !

Although it looked like an acid attack in sc1 animation, the lore has always been a spine attack from hydraulisk.

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