I think having a six month rule is pretty questionable if you're only going to update the list every six months. This potentially allows a broken card to run the format for 11 months, which is way too long. Sure, you can hit other parts of the deck, but you both hit fair decks and other problems decks can appear (think, Faust was in DLR Val, also in Noise, also in Dumblefork).
I think a lot of this is the problem that Damon has (and Lukas had as well in being unwilling to have any sort of banned list), of looking at the game from the perspective of a designer rather than a player. You listen to them talk, and their priorities seem to be having a diversities of cards and factions represented. This is mostly something players want as well, but normally isn't the biggest priority. Player primarily want fun games, and are interested in having cards be hit that have heavily game / meta warping effects (Faust / Mumbad City Hall / MoH / WNP).
You can see this in Damon's explanation for the original MWL. Desperado wasn't hit because it was too degenerate for game play experience, but to encourage other consoles in crim to be used. Yog because it hurt the design space for code gates. Prepaid voice pad for events (which, Damon like 99% of people, don't understand how prepaid Kate worked. Its an underworld contact that works if you have a critical mass of good event cards in your deck. It doesn't restrict event design in the sense that you have to think about a card being played at -3 cost, but is there a deck that can include this card to go over a certain event density where prepaid kate triggers every turn). Lady hurts the design space for barriers and because its out of color, etc, etc.
The six month time frame of cards seems to stem from Damon's interest in letting the work itself out into what he believe is the correct state. He seems to believe that that everything in the cardpool has a good answer, and is mainly interested in preventing an overreliance on certain cards (Desperado, etc). This can be incorrect and tends to ignore the fact it can be pretty miserable to play in a faust or IG dominated meta for 8 months until Damon finally admitted there was a mistake.