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From: Larry McVoy <lm@mcvoy.com>
To: Paul Ruizendaal <pnr@planet.nl>
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Subject: Re: [TUHS] VFS prior to 1984
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On Mon, Jun 29, 2020 at 11:11:17AM +0200, Paul Ruizendaal wrote:
> As several people have observed in this topic, indeed there appears to be a close relationship between a device switch and a file system switch.

Yep.  If you think in objects, they are both objects with a set of methods.
Pretty much two instances of the same idea.