I really agree with a lot that was said above. I love twine and Choicescript and ink games, but I also love parser games, and Parser Comp comes up a lot because there are many people who want specifically more parser games.
I wonder if instead of putting the onus on the organizers if it can just be thrown to the judges? Like a warning or message in the submission page that “Most parsercomp judges are interested in games with text input/output and a world model. Examples of such games can be found here (link to CASA or IFDB or both). Other types of games can be entered but may not receive as much attention or favorable feedback.” Then people can enter whatever they want but won’t be shocked if it doesn’t place well.