You are missing the idea.
They could have continued the show without Sir Patrick, if they wanted to. But still dealt with the legacy of Picard. Picard has to have a galactic wide reputation doesn't he, considering how many first contacts he's ushered in, his involvement with the Klingons, and his faceoffs with the Romulan Cardassians and Ferengi? And the lessons he's taught his crew. And even within PIC, Seven has that connection with Picard from being assimilated and sees how he's the face of Starfleet in the face of phobia towards Xbs. Raffi saw him as a mentor, and Jack's obviously the heir to the legacy. The synth ban was lifted becuase of Picard. the Jurati Borg are around becuase of Picard.
But the executive producers seem very stuck on the idea that they cannot continue a show without the lead. Even though that's not true. NCIS has been doing okay after Gibbs left the show, after all.
I would bet that if Stewart didn’t want to/couldn’t continue making the show, they would have just cancelled it. It’s not like there was some overarching multiple season-spanning story.