I agree and have always wondered why there hadn't been more of an acknowledgement, at the very least by P&G and CBS about this.
Having said that, I don't even understand why people are comparing three wholly unique characters who were each portrayed by gifted actresses (all in their own right). They all needed better recognition, in a way each one was undervalued but yes, I agree that Lisa the original daytime vixen and should've been better acknowledged as such.
Perhaps if P&G had done a better job of promoting their talent, the way that other soaps had done (Susan Lucci, Deidre Hall, Erika Slezak, etc.) there might have been greater recognition. Kim Zimmer had some recognition, especially after she won the Emmy but it feels as if she is more of an exception to the P&G rule.