Richard Kaplan wrote:

"Greg Esres" wrote in message
...

Perhaps the visual approach and cruise clearance fall into the same
category?

Almost for sure these fall into the same categories.

If you are cleared for an approach into an airport without radar approach
service, the entire airport get shut down to IFR traffic until you cancel
IFR, so spacing is a non-issue.


That is often true, but not always true. Timed approaches permit multiple IFR
operations into some airports without radar services. Timed approaches used to
be common, sort of went away, and are now used a lot again. San Luis Obispo,
California ia an example that comes to mind.