There are many questions that are closed which will never get edited and improved, simply because the thing that the user was asking about is not something that person can change. What's more, leaving unsalvageable content on the front page of a site isn't always best for its image.
One notable example is when users post programming questions on Meta Stack Overflow. Typically, these are deleted on sight. They don't get migrated because they're almost never good quality posts, and they won't get edited and improved because the user isn't asking about something that's even remotely on topic.
Basically, questions that are so off-topic that the user didn't have a clue as to what the site is really about can't be improved. It's not a matter of desire or how much involvement the community wants to have in trying to salvage the post, it's just that some posts just cannot be improved, such as this one where a user has an Ubuntu-related question on Stack Apps, the site for questions about the Stack Exchange API:
As you can see, my flagging options are limited to spam, offensive, and "other". Of course, StackApps has only one regular 10k user, so it's not like using the "other" option will create a heavy load for moderators, but on some active sites which teem with 10/20k users, using the VLQ flag option can help take a significant load off of moderators, since 10/20k users can cast delete votes to respond to those flags. Leaving unsalvageable content on the front page of a site isn't always best for its image, yet I feel a bit discouraged by having to use the other option in these cases, since these are typically things that don't require absolute moderator attention yet still require someone's attention.
Is it possible to bring this flag option back, at least for the off-topic close reason if nothing else?