Are you referring to the lack of a marepussy/ponut? I can’t speak for anyone else, but personally I prefer human-styled genitals on the G4 mares/fillies. I just find the minimalist aesthetic to be more fitting with the show’s art style (and frankly I find it more arousing to boot). That being said, I will admit I do enjoy a nice petite pair of crotchboobs to go along with the more human-esque privates. xD
And yeah, I know I’m likely in the minority here considering how prevalent the actual equine-styled genitalia are in the current r34 space surrounding MLP, but it’d be nice to have more “human vagina on pony” tagged images too!
