I'd understand the removal of Jessica tied up in the trunk of a car, but the rest of these changes don't feel genuine to me. Like the rest of the comments in this thread, I assume they will cover up her body in a trench coat to fit this new Private Investigator backstory. That also sends a message to kids- can't be a respectable woman if you have curves! (If anything Jessica Rabbit's look seems to be more of an icon in the Drag community than anything else today).
If we're worried about what is considered family friendly or not, the entirety of Star Wars Galaxy's Edge is themed to war, and celebrates fascist imagery from the designs of the stormtroopers, Empire, etc. That's ok, but a cartoon character that owns how she was "drawn that way" is not. Like
@Collectingbees mentioned, Jessica and Roger have one of the healthiest Disney relationships. Jessica might look a certain way, but she's confident enough not to play into people's expectations of her and lives a life that makes her happy. The funny thing is that Jessica takes a real backseat to Roger Rabbit's Car Toon Spin as it is. If WDI replaced the Jessica tied up in the trunk to something more active, (standing on a box to avoid the dip, to be in a similar state of distress as Roger) there would be no problem and most people would forget she was even in the ride. This revisionist history of Jessica on the ride could also backfire and bring more attention to her character. Kids will go home and stream
Who Framed Roger Rabbit on Disney+ and wonder why her character is different than the one on the ride. I think the main message fans are getting from these changes is that Disney has no attachment to their legacy characters anymore.