Doesn't that also stem from the comics?
spoilers:end of spoilers
Originally the Phoenix was Jean's power. Then when the force was first added in, it was just a force NOT the "phoenix force". Jean's merger with the force created Phoenix.
Then after the retcon was introduced in 1986, Claremont wrote the Classic 8 backstory which shows the force as a featureless golden body whose "form, consciousness, and ability to speak" is derived from Jean. It is only after Jean and the force merge to become one that the phoenix raptor appears. In a previous backstory, Classic 6 it shows that Jean had a painting of the "Phoenix and the carpet" over her bed. Presumably she got the image from there. However, in Classic X-Men 42 backstory in 1990 it shows the phoenix raptor as a subconscious aspect of Jean's childhood mind.
The story about Feron shaping the force into the bird was a retcon that came later. It was an unnecessary retcon as it had already been stated and shown that the form came from Jean. It was all to remove Jean from the Phoenix mythos and diminish her role and to elevate other characters with the Phoenix.
Plus in the comics, Jean has been shown with her own Phoenix-like power with her pink psychic raptors and Teen Jean's pink body form.