Exactly, Bayonetta being prominently featured in Sm4sh was a huge endorsement by Nintendo of an M-Rated franchise. It's part of what led me to write the article.
Also Senran Kagura: Reflexion actually getting a western release. It's exciting times for Nintendo.
I completely agree, games are games. The issue is that "mature games" simply have different audiences and a reluctance to commit to mature themes can limit stories that would otherwise benefit.
No one should worry about looking mature, it's a silly thing to get worked up about. I generally prefer Mario games to most First Person Shooters.
I do think that some Nintendo franchises, namely Metroid and perhaps Legend of Zelda could benefit from ...