Quoted from Russell:Even AFM, MB or MM could be improved with more code. Throw in an Easter egg multiball for doing something hard, or another wizard mode.
With Lyman working for Stern, there's no way he would go back and touch his prior work on these games.
I don't think it would be a good idea for him anyway, and also I'm not sure all the tools would be there to help him make them like deep, new rulesets. No color changing inserts, etc. Not to mention if the changes weren't considered "better", Then you just put lipstick on the Mona Lisa.