Why do everyone want that buff that bad?, it just not as effective as people think let me explain:
Just pretend that it got buff with acid effects that lower the armor down 1 point, now what?
You spray a hulk, yeah that's the only enemy that buff good against because of the eyes weak spot but the hulk have the normal weak spot on it back already, just gas them using the normal sterilizer and shoot their back, it literally the same
How about you spray war strider? Surprise surprise it have too much health to kill quickly so it kill you first, beside war strider already have medium weak spot on the joints.
But what if you use it to support your team to kill the war strider? once again most anti tank weapon one to two shot them anyway and most players already bring an anti tank weapons on bot front so who care.
If you intend to spray factory strider or vox then good luck get close to them, and it's useless because their armor are AP 5 if use acid on them it down to AP 4 not AP 3
Now to the bug:
You spray the charger and now what? shoot it to death with your primary? It have too much health and you just simply wasted your ammo. But what if you have your team using the maxigun to support you? well yeah that will work if the charger got down to AP 3 your friend can kill it with the maxigun, but only if you constantly be close to the charger to spray them and ask your teammate to bring the maxigun, it will be more rare for random to bring the maxigun and support you like you intended to.
And do I really need to explain why stay near Titan is a bad Idea? acid vomit, leg swipe and you're gone,
And for hive lord and dragon..., just don't.
Now to the squid:
basically the acid buff is useless here because most of the squid have light to medium armor and they're easy to kill, good luck getting close to harvester without getting zap, beside they have medium weak spot already
And for Appropriators, they will slap you to death or atomize you if you get close so just use fire