Two cases:
(1) ls /dev would then show what devices are available. [But then,
it's not really the case of looking up non-existent device nodes in /dev.]
(2) ls /dev would not show what devices are available. [A user space
daemon which created device entries when the hardware is detected would
be nicer than this.]
Also, how does the system administrator determine who gets to access
non-existent device nodes? A root-only mechanism would be secure,
but then what's the problem with running insmod?
Note: I'm not saying here that temporarily assigned major numbers are a
bad thing, but at least this "non-existent node" part of the rationale
seems bogus.
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