Being able to open them as well would be nice, but allowing users (of at least TL2, if not lower) to close their own topics would help in a lot of cases and prevent what is described in the thread below from being an issue.
https://meta.discourse.org/t/adding-additional-flag-options/108057?u=orangeandblack5
I also know that other forum platforms do allow this, so it would be nice to be able to open and close our own topics if we need to.