The post kinda touches on this, and makes it clear that config changes isn't the only situation that this would come in handy -- software updates are a big reas

The post kinda touches on this, and makes it clear that config changes isn't the only situation that this would come in handy -- software updates are a big reason too. "Service upgrades are even more important because, while some products are designed from the ground to support config updates without having to be reloaded, they cannot be upgraded at all without a stop/start sequence. Consequently, admins leave bogus versions of those software components running in production because it is never the right time to do it."