Use of system port vs. regular port

Lars Eggert has entered a DISCUSS on draft-ietf-syslog-transport-tls
asking 

"What is the justification for allocating a system port? Why wouldn't a
registered port suffice?
(Note that IANA is changing procedures such that system ports are
becoming more difficult to obtain, because we're running out of them.)"

Is there a reason why we require a system port?  Was this discussed
previously?  Would a registered port be acceptable? 

Thanks,

Joe
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