Movies where nondisabled actors play disabled people (aka "crip drag", "cripface") often make huge amounts of money and win all the awards. Especially if they are in any of the standard disability-stereotype categories ("triumph over adversity", supercrip and whatnot).
Movies where disabled actors play disabled people, OTOH, rarely even make it into the mainstream. Especially if they are realistic and portray us as just people, neither villains nor overcomers nor self-pitying whiners nor any of the other usual stereotypes. (So disabled actors, of whom there are many who are barely making ends meet if that, don't get many roles at all.)
And all of this is regardless of whether the movie is any good or not. It can be a great movie and if it's disabled people playing realistic disabled people it's rare that it will get much acclaim. It can be a terrible movie with a nondisabled person playing an unrealistic or stereotyped disabled person and it will be called "moving" and "inspirational" and all that other garbage, almost no matter what. There are exceptions to both, but they're extremely rare.
This isn't a criticism of Temple or of her movie, I make a lousy movie critic. (Although I'd have turned it down. Which isn't hypothetical as I've turned down several requests to make a movie of my life -- or of what the prospective filmmaker thought my life was, which is rarely what it was.) It's just how these things work.
_________________
"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams