I personally use it for temporarily inhibiting suspend in apps that don’t inhibit it themselves, even when they need to do so. Other people might want to manually inhibit it so that their computer doesn’t sleep while it’s docked in for a presentation, for example. I’m sure many others in the community have a use for this functionality as well. If so, then please share it in the comments, so we can make a case for this feature 
Although this can be achieved with the Caffeine extension, it should IMHO still be built-in to the desktop to provide a more complete OOTB experience for people with such use-cases.
This topic is for the discussion around the OOTB implementation (or not) of this feature.