Connie practicing ethical non-monogamy is a fun change for the new series as it not only opens up King of the Hill to explore a new kind of change in culture since the original series, but also could influence how she relates to Bobby in the new episodes. It’s currently unclear as to whether or not Bobby has ever gotten back together with Connie following the end of their relationship in the classic series, but with the two of them still hanging out it’s likely that Connie is open to the idea.
So less about accurate, positive light and more about an expanded view of what it means in general. Of course, in an accurate positive light, but that wasn’t the argument you were trying to make.