It's definitely not an EB only fault.
My daughter was born without her hand. She complained that if there was a character without a hand in children's book it was either:
1. The villain, often used to enhance their evilness (you've all immediately thought of Captain Hook or Peter Pettigrew, haven't you?)
2. Sidekick of villain, used to show the villain had a not-quite-so-bad side because he couldn't be so bad if he liked a "Disabled Person" could he?
Some authors use love of a cat/dog in the same way. Occasionally used the other way as "they even are nasty to the poor vulnerable Disabled Person" too.
3. Put in as a token disabled person with no personality nor plot like other than This Person Is Disabled. So would appear just to not be able to do something, or on way to get a hospital appointment. Anything they said had to involve reference to "of course I don't have a hand" and it's what everyone mentions about them. Constantly in case anyone might forget it.
When the reality is that she gets on, does almost everything that anyone else does, and although nearly everyone asks about it when they first meet her, in real terms it hardly gets mentioned after that.
Tbf it is hard to write a realistic story making sure your readers are aware, but not batting them over the head with the prosthesis constantly. I wrote her a set of adventure stories after she complained the above and a lot of the time it's small hints, like twisting to get something, tucking something under her arm to carry it and sleeve flapping. You don't want the reader to be jolted out of their internal picture of the character every time you have to mention it, so you do have to keep it in their consciousness because people naturally don't imagine the character with one hand unless you tell them. But a lot of the things people expect her not to be able to do because they couldn't imagine themselves doing it with only one hand, my daughter would just get on and do it, perhaps slightly differently. So in the story you need to mention that she's using her little arm to balance as she climbs the ladder (yes, Thorpe park, she is more than capable of climbing a ladder. Probably more capable than whoever decided that amputees can't climb because of the risk of them having to use the escape ladder...) but not go on about it. So you end up with something like:
"She paused, balancing herself with her little arm curled round the top rung. 'Hurry up!' she called. 'The window's open.' Her hand stretched up and felt the window ledge..."
So you've got a small reminder, and letting the reader know how she might use her little arm on the ladder. However if you're not looking for it, you can easily miss it.
And if you don't have personal experience of the disability, then it's really easy to make assumptions, and that can very quickly go into offensive. (as the assumption that looks=character is too). Even if people are trying to be careful they can make assumptions if they don't know. And add onto that the issues that different people with the same disability can find different things unacceptable. I remember an argument over the term "stump". Some of the amputees felt it was offensive; some used it themselves and didn't see a problem. So even if you have a sensitivity reader to check, you may find others disagree.