They completely replaced the most important aspect of Tiana’s character from the film (wanting to own a restaurant), for no discernible reason.
The equivalent would be if in FEA, Disney created a backstory that after the events of Frozen, Elsa discovered she could not only control ice and snow, but also sand, and then had the ride be a visit to a beach she created, where we see her using magic to build sand castles while singing Let It Go.
If you’re going to use a character from an existing movie, why change the thing about her that people already recognize?