I would imagine the difference comes from balancing the effectiveness of the shampoo versus how irritating it can be to the eyes. With kids, eye contact is much more likely. As you age, you learn/understand how to not get shampoo in your eyes, so the balance moves in favor of effectiveness. That said, it is only a guess.
Another word for no-tears shampoo is weak-ass shampoo.
The same thing that makes shampoo irritating is what makes it react with dirt and oil. Small children have finer hair and less body oil, and don’t need shampoo to be as strong. They also don’t use gunky hair products that require strong shampoo to remove.
Kids shampoo is just diluted with water. All soap is on a spectrum between water and something that will burn your skin off.
So for kids it’s on the easier side of the spectrum while adults have an easier time knowing how to avoid soap in their eyes and what to do so you can use something stronger.
But there’s no law against using kids soap so if you really want to avoid burning eyes then go ahead.
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