Roberts may be "God" to MTMTE, but you have to remember Barber is his editor and Hasbro must approve what he does. There was a thing for issue 15 where he wasnt sure if hasbro would let him put "I love you" as Rewinds last words, but they were all for it! And on top of that, when he started the book, Arcee was the only female (and not in his book). To him, females did not exist until issue 25 or so when Windblade and crew were introduced, and not overly again until issue 41 where Thunderclash was found, and even so he has only chosed 2 females: Nautica and Velocity.
And since the robots are genderless (they have no need to have them since they cannot reproduce), they really do not need to call each other he or she. it is he just because it is the most common use of those 2. And now that we have shes, it's really not that big of a difference since there really isnt a difference between them except chassis design and pronouns.
And also: Roberts is fully aware of what may be bad. In the original issue 31, Nautica had a different spark type, but roberts went in and edited that out so as to not make females different like that. He is aware of things (and so is Barber), and the direction they are taking is ok.
And please, enough with the argument about boys and adults. They are all experienced and have been online a good bit, and they learn quickly, as Getaways preview for issue 48 shows. Size does not matter. Neither does the avatar. They can be whatever they want! And the avatars are for disguising as other races which do have genders for different roles, so they need to have gender there
