I would like to have some official words about these gameplay changes. I hope Atlus/SNKP talk about it soon somewhere. Terry spending 2 stocks for NeoMAX could be just because of Single battle mode.
Perhaps there is a health element to it, a la MAX2 moves in 2002? Some ideas:
1. NeoMaxes can only be done when character is at 1/5th health, but they cost two bars.
2. NeoMaxes can be done normally for 3 bars, but for less when at low health.
I think I'd be okay with this. The air EX DMs are great news, but I honestly don't think Kim needs it specifically. Mai and Athena would definitely, definitely benefit from it though.