The thing about Transformers is that every continuity that lasted for a decent amount of time fundamentally changed at one point or another. The third season of G1 was quite different from the first two seasons. The later Marvel Transformers comics were different from the earlier ones. The G2 comics had quite a different fictional universe from the G1 comics. Ditto to Regeneration One. Beast Machines was quite different from Beast Wars in many ways. RiD 2015 is quite disparate from Prime. If Animated as an ongoing continuity had lasted longer it likely would have changed drastically at some point or another. The movies are no different from other iterations of Transformers in that regard. If you want my opinion, I think fictional universes should change a lot over time. Many people desire character development in films, but what about fictional universe development? That is at least as important, because characters usually change as a result of the fictional universes around them changing. Views of past events change over time, and sometimes people realize that what they once knew wasn't the whole story.