"People are allowed to change things in adaptations!" Is the "well it's not illegal" of adaptation defenses.
If your only defense of a change is that they can do it, and not how it helps the story, then that change is probably pointless and unmotivated. Or it sounds like it.
There are lots of reasons to make a change! Limitations of a new medium, wanting to expand on a certain character or idea, wanting to explore a theme from a new angle, changing with the times.
Moulin Rouge and Legally Blonde the Broadway musicals are both very different from the movies they're based on, and I really like them! I think they're interesting takes that stand on their own and embrace the new medium and I can point to every change and explain why I like them!
And obviously not everyone's going to like or agree with the reasoning you give, and they're allowed to say that's dumb or not worth it. But at least you're not grasping for the bare fucking minimum












