No it's not. It makes no sense to say "oh, you can't commute to work and then home again five times a week? so how do you get groceries?" because those are two completely separate things in completely separate environments.
It's none of Amazon's business how people manage their disabilities outside of work. The only thing that matters is what the most effective way of managing their disabilities is inside of work. Amazon is not your doctor, and if your doctor says that this is the most effective way for you to manage things while being productive then they need to accept that the doctor knows what they're doing.
Part of which is that people face lots of stigma around disabilities still, but also the need to have some historical and diagnoses paperwork is a barrier that I suspect lots of people don't want to go through.
Frankly, I don't believe its rampant to begin with, and I can't find any real evidence that supports that people are widely abusing these accommodation requests.
Lots of people in offices don't do much work too. I mean, that was true before people worked from home. Can you actually cite any statistics that prove this is a widespread, pervasive issue?
Anecdotal evidence only seems to serve proof that you're annoyed at a bunch of things people do in society and somehow that means accommodations in the workplace for people with disabilities must also have the same perceived issues.