Completely baffled by the behaviour of SLA policies when tickets reopen - see bold text below:

Periodic Update: If a ticket is reopened with an end user comment, nothing will happen. If a ticket is reopened, with or without an agent comment, the relevant Update metrics activate new targets.
Pausable Update: If a ticket is reopened with an end user comment, nothing will happen. If a ticket is reopened with a public comment from an agent, the relevant Update metrics activate new targets.

What's the thinking here? Surely if a ticket reopens, the update SLA targets should appear again? Some action is expected from the agent in almost all cases, right? Am I missing something? Is there a workaround?