Collecter of Gobots and Godzilla
I think the very issue is that the Beast Wars is specifically the battle that happens on earth. There's no guarantee that any other group of Maximals or Predacons from that era would have scanned Beast modes (and, in fact, one group on another world scanned plants), and without that, the whole Beast Wars moniker is kind of worthless. So, any writer tackling Beast Wars has to use the established cast and story, sidestep it with a "meanwhile, on the other side of the planet" sort of thing, or throw out the original premise and go in another direction. Which is either going to be unsatisfying, or possibly offend fans of the original. And it doesn't help that the overlying endgames in both Beast Wars and Beast Machines were so epic. A writer could do "Maximal Missions" and "Predacon Plots", but would those be as well-loved as the originals?