Season 10 wasn't Roseanne-centric either though. Darlene was still the lead but in Roseanne's shadow. Now there's no shadow and Darlene is clearly the lead.
The show being about Darlene because Sara is EP isn't a bad thing. It's just something you have to consider. The revival idea took off because she had Goodman on The Talk and they did a back door pilot with that Roseanne inspired sketch on the couch.
Roseanne was persona non gratis in Hollywood even at that point. Goodman and Metcalf had successful careers acting in other people's production and Lecy and Fishman hadn't worked in "the business" for decades.
Gilbert was the driving force and wanted to make it happen and she had the means to do it. In that situation, no person is going to just step aside and play second fiddle to someone else, even to Roseanne. The revival was always going to revolve around her character. Look at season 10. Roseanne is practically an extra. The only episode I can remember her being on screen for most of the show was the Muslim neighbours one. Sara didn't just take the reigns once Roseanne left, the original premise of the revival was her being the lead with Roseanne just being the figurehead.
Again, it's not a bad thing, but it would be more accurately called "The Sara Gilbert Show" and not "The Conners".