Earlier quoted context omitted.
I agree with you, but a quick note for potential readers: most of the soy sauce from your grocery store has extreme amounts of salt in it, beware.
Most American grocery store soy sauce is also not authentic soy sauce. Soy sauce has to be aged from soy, salt, wheat, and a fermentation starter. American grocery store soy sauce is typically salt water with flavor additives. Ingredients for a cheap American soy sauce: soybean, corn, water, sugar, sodium benzoate, salt, caramel color, monosodium glutamate, citric acid, potassium sorbate.
If you start getting into different kinds of legit soy sauce then you'll find more subtle differences of course, and depending on what you're cooking, they may be relevant. I don't cook at home with enough precision for the difference between “primary” soy sauces to matter much, but if you start learning an actual cuisine, that's different.
(No affiliation.)