for the number of times, this kind of thing happens, this is an unnecessary complication to the rating system and its implication would bring more counterproductive paperwork or leg work to deal with appropriately.
these people are crybabies and or may be poking fun at the Terms Of Use that newgrounds has
You affirm that you are over the age of 13, as the Newgrounds Website is not intended for children under 13. If you are under 13 years of age, then please leave Newgrounds immediately - there are lots of other, more pleasant web sites out there that won't horrify your delicate parents. Talk to your parents about what sites those might be.
let this one go bud
Remi-le-Oduen
Could be useful, though it can somewhat affect creators who do both sfw and NSFW materials. For example, Diives draw amazing art and animations dedicated to his country culture. Would be a waste if someone misses them just because of A-rating turned off. So I don't like the idea of NSFW artists having x rating on everything they post. Overall, maybe it's more simple to just expand A-rating criteria?
CrimsonKero
Diives has more followers than ninjamuffin99. I would prefer that Newgrounds would keep its focus on SFW content and creators.