I get ya man.
The dev has done an incredible job, but I think finishing quests should be his big concern. I played up to the previous content update and it was great but there was a lot of unfinished stuff. It doesn't have to be either. Write a story for that character even if it features multiple choices, then when all characters content is finished he could then do the main story missions and let previous characters content tie into it if needed.
When a dev leaves quests longer and longer to be finished, that's when it feels like they didn't know where to go and in most cases abandon them. Or worse. Remaking old scenes.
It has potential to be great though, so hopefully the dev doesn't end up just casting aside everything.