this is less of a problem if you're more into the 1 change == 1 commit workflow.
tug = ["bookmark", "move", "--from", "heads(::@- & bookmarks())", "--to", "@-"]
It moves the nearest bookmark to the commit before the current one (which should be your working commit).That doesn't mean it couldn't be a core command someday, but given that the alias works well for people, there's not a ton of reason to make a whole new command. You configure the alias and you're off to the races.