I think DTC needlessly axed a few of the characters from the Lorraine Newman era who had some potential.
I can definitely understand getting rid of Sam and Poppy because they were crap. AJ was uneventful and wasn't going to be around forever (plus Shabnam was reintroduced which more than made up for it). He was right to cut Dexter in the end and Carl was rubbish.
Jake, Danny, Kirsty and possibly Ava were worth saving IMO. Given that some of his own creations like Tosh, Aleks and now Charlie have been axed, those spots may not have needed filling if he kept those 3 or 4 Newman characters around.
The current version of Cindy (Mimi Keene) was brought in by Newman, and hope she sticks around. She's definitely needed for this unfolding Beale saga.