That's a fair enough statement to make, in which case looking at the character as a whole, is still half as likely to be unsafe on a 50/50 as Ermac or Mileena are since they have to guess twice, and the character as whole most the time will be going for double 50/50's, but making it safe by cancelling stance is ALSO her dirt and not an option Mac or Mileena have
I just don't think she can hold a candle to those 2 let alone other characters REALLY unsafe on their dirt, like Raiden or Sub, I guess calling her one of the safest isn't fair just because she can cancel her 50/50, you are right, thats her dirt and she needs it and she is one of the less safe characters in the game when she uses it, however she is still MUCH safer than a LOT of characters