Several flaws.
One does not typically exceed the acute limit for water consumption because of the thirst mechanism, yet the aspartame limit is far below that. When a substance cannot be used in half of your daily consuption of fluids (e.g., 1.5 liters of Crystal Lite) without giving crippling headaches, it’s in a different category. Therefore, your statements can be false if the caveat is omitted.
Secondly, is there a chronic limit for water consumption like there is for aspartame?
Etc.
I’m fine with the stuff being on the market, but let’s be honest about it—on both sides.
Then what causes one to typically exceed the acute limit for water consumption?
yet the aspartame limit is far below that
What is the acute limit of aspartame consumption? How many liters of a soft drink sweetened with aspartame does someone have to consume to cause serious physical harm?
What is it about drinking too much Crystal Lite that causes crippling headaches?
Secondly, is there a chronic limit for water consumption like there is for aspartame?
Not sure what you mean by "chronic limit" but water does have an LD50. I don't remember what that is but I'm sure you can find it.
I’m fine with the stuff being on the market, but let’s be honest about it—on both sides.
Then let's be honest. If I have to tell someone explicitly that consuming too much of something (in this case aspartame) can cause harm to them then that person is an idiot. Your criticism was splitting hairs. You'd have to consume huge quantities of aspartame sweetened beverages to cause physical harm, just like with water. To a person with normal intelligence, it is understood that when a product has been on market for 30 years without any negative impact, we're not talking about someone who might have intentionally abused the product causing themselves harm. On the other hand, long distance runners have, on many occasions, consumed too much water, thereby diluting the sodium in their blood and causing hyponatremia and, in many cases, death. I've never heard of anyone dying from ingesting too much aspartame. You?