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Apparently this technique is slow and anyone can easily dodge it, pretty much what everyone just states without any proper explanation. I dont see how that is possibly given it was only dodged by a very fast snake. So anyone faster than Manda can dodge it, how many characters are faster than Manda?
Katsuyu is a slug and they are known to be slow but she isnt going after someone she is spitting on them and she doesnt spit slow.
Also if you look at the size of the boulder Manda spins off its almost as wide as the end of his tail, the attack covers a wide area so it cannot be simply dodged. Katsuyu wont be spitting at a big snake, she will be spitting at tiny humans who cant outrun such a large amount of acid falling them.
This wont be used at a long range but if someone wants to attack Sakura or Tsunade they have to come by Katsuyu but going near her will be a very bad idea.
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Imagine characters running towards that to try and hit Sakura or Tsunade, they will without a doubt be hit by acid trying to get to them.