Right now, the use of status.json at
https://github.com/ietf-tools/Rfc-Errata/blob/master/Rfc_Errata/run.py#L75
makes using the flags that affect which errata types are shown "sticky".

That can lead to user confusion when invoking it with no arguments later causes behavior that doesn't match the default.
There's not a significant advantage for that particular bit of state being sticky - the command line invocation should document what's actually happening.