I think there is a good reason for categories to not get deleted "automatically".
Scenario:
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You have a PropertySource that sets one or more categories based on discovery that it runs against a device
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One day, that device is having issues when the PropertySource runs and one or more of the discovery steps don't produce the expected results
In this case, you wouldn't want the categories set by the PS to disappear, as that could affect your monitoring/alerting/etc. So I see why it doesn't automatically remove them when a PS doesn't set them. But it'd be nice to have an easier way to do cleanup... Guess I'll have to do the deep-dive into the API (which I need to do at some point anyway)...
Neophyte