Dion follows a set function, neither one of them have functions that are enhanced by alt modes, also it is hinted at that not all Cybertronians (Cybertonians?) can transform or have vehicle forms, the decepticons in that episode transform into boxes and trucks. while the some of the civilians have a truck mode, not all of cybertron's populous necessarily can transform, in later continuities we see transformers ferrying around other Cybertronians like taxis. also the remains of the mass transit system are shown during the episode
Desertion of the Dinobots. that said to each teir own interpitation of the techno-biological forms of the peoples of Cybertron and their unique shapeshifting abilities. just as long as we agree. Bay-formers do not come from cybertron or any other Transformer world.