On an almost-daily basis I create Figma files which contain only one loose frame or layer so that I can quickly export it or try something out. These files often go for months, never touched again, in my Drafts.
It would be awesome to be able to delete a file from within that file (i.e. go to “File → Delete”). This would also be useful for those moments when I reopen one of those ancient “Untitled” files to see what it is and realise I want to delete it.