I mean, yeah, you're right, I was being sarcastic

Obviously they don't put it in to destroy your teeth, and despite what the other replier said, it _does_ matter why, which is _why_ they went through the effort of wrongly attributing why it's done

p.s., phosphoric acid is delicious, that's why people like products with it in it. Back in the days of soda fountains, they'd add it in! Now it's mixed into cocktails, sometimes with various other acids (citric, tartaric, etc)