system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Is there seriously a spell designed solely and exclusively to transform animals into water goblets? (Vera Verto) What would the possible practical use of such a spell? Why teach it to kids?

Ok, I get it, kids need to practice, but are y'all claiming that the sole purpose of this spell is to teach kids the basics of transfiguration? Spells do not come from nothing, someone invented them, usually for a purpose. What is the practical application of turning animals into water goblets? If you're threatened by a lion it may be easier to, you know, just kill it. And if you desperately need a water goblet, then I'm pretty sure it'd be easier to get one from transforming something that is not ALIVE. Or maybe not, correct me if I'm wrong.
gpt
As practice.  Doing magic well requires some familiarity with moving magic around.  Consider them like agility drills for football players.  There is little practical application in and of itself for running in place and dropping down to the ground.  But do it enough and you start to bulid a little agility.


Similarly, turn animals into water goblets enough, and you will start to get a basic level of skill and understanding of the art of transfiguration.