Emphatically yes. It's always possible that your assessment might be incomplete, or that the situation could change. If you can allow for that possibility, at

Emphatically yes. It's always possible that your assessment might be incomplete, or that the situation could change. If you can allow for that possibility, at low or zero up-front cost, then -- I don't know, maybe it's the adulthood speaking here, but -- why would one not do so? :)