Bullshit. How many times has that same argument been used to justify not casting ... anyone who isn't a straight white male?
It could've really worked here. As I said, this is a Kevin Hart movie. He is the headliner. No one is coming to see this movie because of Brian Cranston. Not to mention, he's never opened a hit film. Hart opened this flick at number one. So, they could have easily gotten a disabled actor. There are plenty out there. They're just being overlooked.
Unless it's a role where the person in the chair eventually walks or something like that happens, casting an able bodied person in a disabled role is like casting someone white as Black Panther.