This has been true of the company for decades. It's why Don Bluth famously quit, as did a lot of future name talent in the 80s.
Over the years, Disney has lost creatives like Chris Sanders, kicked people out because of changes to their animation department, or those they felt were controversial. They are not known for stability and there's a reason why so much of the company's product is sequels and remakes.
You don't work at Disney to have your vision come to life. You work there to support the company's goals. Sometimes the two go hand in hand, but certainly not always. Even if your project gets made, it could be dropped by publicity or go straight to streaming with little fanfare. This is not a unique to Disney problem, but they are also not exempt from such behaviour.