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Personally I also preferred the ‘Everything is an object’ from the lisp machines. However, I also believe that files are an acceptable object format, since if several applications know how to manipulate a file format, it’s basically duck typing.

I believe file systems could have a more formal method to query the file’s format, and has less latency so that applications could use files as an inter communication format.

There are some things like audio where it's nice to simply copy an audio file to a /dev/audio to play audio and read from /dev/audio to record audio.

That doesn't preclude having more advanced interfaces, too.

It could have evolved into REST (which it didn't, but they're deceptively similar).

Just have a look at Plan9.