The unreadable tag makes very little sense in my opinion, as it encapsulates multiple, technically unrelated concepts. The usage guide reads as follows:
This can describe a file or any output that is not readable by the user or a program.
This can mean the following:
- A text is too small for the user to read
- A font is missing (example)
- A user doesn't know what format a file is (example)
- There is a permission problem with a file (example)
- A version mismatch prevents a program from reading a file created with a different version of said program
- Hardware failure renders a storage medium unreadable (example)
- A user doesn't know how to open a file (example)
There are many many more examples of what could prevent a user or program from reading a file or output, but the examples illustrate that none of these have anything in common. If we look at the first burnination criteria (even if this is not a burnination request), we can see that the tag does not describe the contents of the questions to which it is applied.
I believe that unreadable does not add any value to the questions to which it is applied. Or is there any deeper meaning behind the tag, which I don't know about?