It is a poor trade. Giving a user an additional gid or uid (for program lifetime), in programs which have not been reviewed (or -- cannot be reviewed and fixed), is not good.
Before, setgid games could be used along with another bug to fill /var. Now, you can just fill /var because you made it writeable to all. You are making this program give the user an ability that didn't exist before. The ability to fill /var. Shit breaks pretty badly when /var is full. Score files in this garbage program are not important enough to create that risk for users.
