From what I remember reading, Mark Goodson simply preferred the old-school way of doing things, since it was one less thing to worry about breaking down. Even though he\'d been gone three or four years, the production staff prolly didn\'t see it as a pressing issue, so long as it worked. So, I\'d put a dollar or two on \"Because.\"
I know other Goodson(-Todman) shows used chyron going as far back as Super Password and Combs\' Family Feud, but those were also revivals...had Password+ continued into the mid-80s, they could\'ve very well kept art cards and crawls as well.