Adding my two cents after browsing:
I am one of the viewer's that loved Diana. She's in my top 5 favorite knots characters, I found her fascinating to watch, very realistic and relatable character. They wasted her like they do everybody that's not apart of the A cast on this show. She never should have left, Diana needed to make her way back to the cul-de-sac and been paired with Joshua. And i could also see her competing with Paige for sumner.
I will support Doug Sheehan (Ben) in his decision to leave. He was right, they didn't properly use him outside of being a place holder. They refused to give Ben layers to become more compelling to watch. Yes, Knots is a female show, but Greg and Mack got decent airtime and Point of view, Greg becomes the show in its later seasons.
I wish he had stuck around, and they brought in Aunt Ginny as someone from his family.