This isn't about kids, this is about a wide variety of players who don't have a problem with a super smart hamster when there is a talking gorilla with a jet pack and a lightning gun or a fat guy who becomes invulnerable when he vapes. If you are looking for realism then you came to the wrong place from day 1.
There are also anime fans, the entire asian market is motivated by the art of cuteness. Maybe you have noticed the slight touch of anime art style? I am finding on the PTR that females love cute characters as well regardless of age.
People get all bent out of proportion when a company puts out a game they enjoy and then create something that they personally don't like as if the entire world revolves around that one person. It doesn't. Blizzard can make things for all kinds of people, a little of this and a little of that.
I personally don't care for playing cute hamsters in games but I do like what the character can do in the game and I'm willing to look past it because I can do something here that no other tank can do. I can shoot a fucking pharah out of the sky with ease as a tank because the only other ranged tanks in the game either have to shoot off 7 buck shots or they have to spray and pray because Orisa's shots travel so slowly.
If they create a character I don't care for and can't stand I will not play it and go out of my way to turn it into a grease stain but I am not going to pretend for one second that every single thing this game creates needs to be done with me in mind because I am not the center of the universe.