Such condition could be used for various cases, first of all for trigger based internal events.
For example if new host just has been added, zabbix server restarted, host became unavailable etc.
Should be available to be used for items/lld-rules/triggers.

Together with ZBXNEXT-3140 (new macros to indicate error message of item/lldrule/trigger in internal monitoring alerts) such part of internal monitoring should become much more usable.