In this case it's the system that's at fault. No mid level bureaucracy decided to ask disabled people to prove their disability again and again, that's clearly a political directive.

It's more complicated than that.

"The system" almost always consists of mid-level bureaucrats. Maybe not this particular one, but her bosses -- a job which, if she sticks around long enough, she will eventually get promoted into. A large amount of what the government does isn't formally law, it's policy, which is often decided by those mid-level managers.

And like individual bureaucrats, "the system" in this case finds it easy to make demands of people if those demands do not result in increased workload for the agency. But if they do result in increased workload for the agency, then the policies that result in that increased workload often get rethought, or the agencies suddenly discover that they can make allowances, and so on.

In this case, I'm confident that "agency X cannot accept pdf documentation" isn't actually law. It might be guidance issued by an agency lawyer, but that isn't the same thing. It is likely to be a policy decided fundamentally by the IT department, which is estimating a high cost for securing the agency IT system to securely handle pdfs. That cost is compared to the cost of accepting faxes, which is significantly lower, and so a policy is issued that the agency cannot accept pdfs, and the legal guidance is offered as justification.

What is not factored in to the decision is the cost to the taxpayer. That's an externality.

So, if the taxpayers can magically make it much more expensive for the agency to accept faxes, so that it is suddenly not an externality any more -- which is what happened in this case -- then the above calculus changes, and the agency discovers that, you know what, actually we can accept pdfs. The IT department is ordered to make the necessary improvements, and it all works.

In my particular case, we were told for literally decades that we could not telework. It wasn't secure enough. Then COVID happened, and suddenly we had a telework system in place, with all the necessary Microsoft licenses purchased and servers stood up and laptops issued and VPN accounts activated, in less than three weeks, and nobody said anything about telework not being secure enough ever again. Because the original justification wasn't true. Setting up telework was more expensive, so we didn't want to do it, and we came up with reasons why we "couldn't". As soon as it was cheaper, we found out that we could do it after all.

I know for a fact that in my institution (a university) certain things can't be done by sending a pdf because the guidence our adminstration is accountable to (city, state, national) mandates them to have it in paper. All clerks I have talked to find that silly, but they can't change it and since they have to proof things to these superior offices one cannot expect them to forge these document for you as a service.

There are stupid, lazy clerks who take any deviance from "the process" as an excuse to refuse work, but often it is the internal rules that are at fault and not the individual.