I think this is fine for an action based video game, but for a long running show it would get boring fast. Besides, Transformers were created to be in earth modes, in hiding. Anything involving Cybertron modes and the history pre-earth was added after the fact. I feel that they work best as a concept focusing on this, at least to start. Space-faring sub groups are fine, but to me, at least, Earth should always be a focus, for energy reasons if anything.