I think the E10+ rating was a stupid decision by the ESRB. Along with PG-13 from the MPAA. (Before you say anything about that YES I know the stupid BS story behind it!) I’m not sure which rating system is worse. On a side note since it’s been done your idea isn’t necessarily dumb but rather unique. They could at least make the ratings look more clear on the game box arts. God knows how many people it’s probably confused. On a side unrelated note I think the new designs for the MPAA ratings are so hideous! They didn’t need to change the size of them or anything! It’s not like people couldn’t already read them! I bet if they retired that rating for at least a year or so they could learn a lot!
(The reason your idea isn’t dumb or bad is because since it’s already done with the ESRB so it’s nothing bad.)