There are some huge plot changes here that while they may attract some people we leave a lot of fans feeling neglected.
Of course it isn't reasonable to follow the books word for word, but why kill off so many of the most interesting aspects of the series?
But the thing is RYTX, I or even the greediest studio head can or would try to adapt all 54 books and 4 megamorphs.
And I barely even 'changed' anything. Just really Tobias and Marco's mom. I DELETED alot (David, Crayak, Helmacrons, Leerans, the Chee, etc.) but CHANGED? Not so much.
Here we learn about the invasion, how they got their powers, how the controllers destroy lives, meeting Ax, meeting the Ellimist, destroying the Kandrona with some time traveling and mutant fish people to boot. How can fans not be satisfied?