so I think that in an abstract world of arbitrary reality, stating "everything is a file" is okay but we have a lot of evidence that implementing something where everything actually is a file is just too hard. If the philosophy is good, why do its adherents produce so much that is crap?
Well, for the PTY example above, the reason is backward compatibility. Eventually we need to decide to rid ourselves of the limitations that backward compatibility (with, e.g., bash) brings and clean up the implementation.
