@Buster Skruggs
Because his only mids are quite slow compared to the "top." While B3 is safe it is slow and F3 while a great utility is unsafe. And both only lead to a knockdown.
He does have an OH at 25 frames so that means that nearly every person on this site can react to it (lul). It is safe though, but quite slow.
His low is unsafe.
ALL versions of Kano ball are unsafe!
His cmd grab is a high which is hilarious when you look at Geras with his mid grab. Guess he needs it. Anyway if you watched CB yesterday there were some prime examples of people sniffing out the tick cmd grab or raw grab by neutral ducking and punishing. Though many missed full combo and only poked because i think they were surprised they were right.
ALL his strings start with a high. The two you listed are not really mix ups because you can block the same every time and defeat the string.
So pretty much any read/guess the opponent makes on you weather you are trying to condition or trying to mix up can be punished. He literally lives and dies by that. There are many ways to blow him up. Doesn't mean he can't get wins and the opponent still has to know what to do and actually do them. That goes for any MU really. But for most now days why take the chance.
Meanwhile there are characters that don't have the lack of safety, highs, etc. For many why play Kano when you can play a char with fast long range mids that are also safe or have a way to make them safe and lead to full combo. Better mix ups, often with more safety. Better and easier KB's. And of course possessing a fuck neutral move. See it yet?