Why not just make *all* the docs accessible?

[kestrell]

Re: that faux pas of receiving an acceptance letter to a disability-related group, sent in an inaccessible PDF format: I received an apology from both the team leader and the IT person, assuring me that usually an accessible Word doc is also included along with the PDF, but somehow it failed in my case.

I really wanted to ask why they didn't just make all the PDF docs accessible, but didn't want to sound antagonistic.