Yeah, that is one of the risk factors with making such a huge update: so many new systems will all be interacting in different ways. It makes bugs more likely and it makes locating the source of those bugs more difficult.
A "1.0-level update" also sacrifices one of the biggest benefits of early-access numbered updates: the ability to test ideas on a smaller scale before dedicating resources. If the developer, say, made controversial adjustments to the game's art and revamped every scene and every game location, it would grow increasingly difficult to undo those changes. I think Kal is proud of his work, and I don't think he wants to undo that work, but the sheer scale of the update makes it increasingly difficult to correct mistakes.
I have concerns.