Paige was a great addition and needed to happen for a show like
Charmed to be able to withstand the amount of years it did on television especially with an all-female lead cast. Otherwise it would just be exploring the same stories and wouldn't have fresh new material to work with. Kinda like how season 8 feels

Shannen even said this herself.
But if they were smart they would've paid Shannen a **** ton of money to return for season 8 instead of paying for the Janice Dickinson cameos and Kaley Cuoco cast additions and slashing the budget cut for their powers

for a show about witches
But we all know how stubborn Shannen WAS... oh well at least she recently spoke out about meeting Rose, doing a reunion special, about how she was asked to return for the series finale and her departure from the show at those Charmed panels at comic cons. She provided a lot of insight.
Anyways, I saw an article about how Holly and Rose were complaining about how ****** The WB network was in regards to the show during season 8. Maybe that's why it was so bad.
