In another thread @Gregolas wrote:
The problem with that is you don't want any particular gist to explore multiple areas. Your storyform might have an OS Concern of
The Past but NEVER both. If you try to make it both you'll muddy your story, muddy the message of your narrative's "argument".
The point of gists is to hide Dramatica's cold structural terms beneath a blanket of creativity-friendly, inspiring words -- but still have those words represent as closely as possible the Dramatica term. i.e. give you "the gist" of the term. You want to be able to look at the gist for inspiration without worrying that it will take you in the wrong direction. Like you said, if you had an OS Concern of Becoming with a gist of "ruining the time machine", and you were brainstorming based on that... you might end up writing down something that should really be in the Activity domain or Situation & The Past. You want to be able to use the gist to forget about Dramatica for a while (although keeping the Dramatica term in the back of your head if you can), confident that you're still standing on the solid surface of your storyform's structure.
Of course, you could use the gist of "ruining someone" for OS Concern and end up with a story that involves ruining a time machine. Maybe the MC or IC invented the time machine (their concern is The Past) and the Story Goal is to utterly ruin them, so naturally manipulating things into destroying their precious time machine might come into it. But that would be a very different story from one where the OS Concern is The Past, or the OS Domain is Activity.