Liz doesn't need a nerf, just a bit slower recovery on whiff. Vice has just as much juggle ability from her 41236[BD], and that leads to even bigger damage combos.
Anywhere juggles that take meter can be compared to a DM.
This is an interesting point and 4leaf was discussing to me about this point. One way of looking at it, is that Ex moves are completely new territory as far as KOF is concerned. They were obviously designed to extend combos and enhance the attributes of specials and allow for new combo creativity. Strictly speaking, Liz's DM is definitely an exception to the rule where normally DMs don't juggle in the manner she can do it outside of a "counter" message.
Personally, I feel that certain special moves are setup do specific tasks such as juggle/reset/throw; Chin's hcf+K, Kyo's qcf+K (although personally I feel it should only juggle on grounded opponents otherwise it's like a dp+P that juggles without a counter msg--but I disgress), Andy's Kuhaadan Break (hcf+K~BD). I feel that Vice's Ex DeCide was designed to do so and would fall under that category. I dunno if the developers wanted Liz to juggle like that, but I'm fairly confident they didn't intend a second reset juggle.
Another way of looking at it is that Ex = DMs now, and therefore it would put Vice in the same category as Liz. The reason why Vice can do more damage because Ex moves were setup that way, generally, less damaging than a DM alone but allows for further follow ups with [DC] etc...