At the height of Windows awfulness Microsoft was one of the most valuable companies in the world. So...
Yes they were, But the alternatives at the time were even more awful.
No ones opinions are correct 100% of the time. Steve Jobs was no different. Personally I think of that list you gave, screen size is the only one he was truly wrong about. And even that may be debatable. Keeping to a single screen size may have contributes to the success of the 3rd party apps. Which as you stated he was wrong about also.
Reading his book, My opinion on that is that he was opposed to the idea of other people freely adding code to the iOS platform. At the time he didn't see the possibility of controlling these 3rd party apps via a single source (the App store). When that vision evolved he accepted the 3rd party option... once they were allowed into that Walled garden. Another one of your points...
I think he was spot on about the walled garden. It's one of the MAIN reasons I buy Apple products. So he may have been right about that.
Styli - Not wrong (yet)
Multi-Tasking - at the time Apple wasn't able to do it efficiently on a small screen, and without eating the battery. so at the time, it wasn't beneficial.
File Management and File sharing - This has been done. Not sure how he was wrong
Copy/Paste - was he against it? or just a missing feature early?
Cell Providers - How was he wrong? Not sure what this means.
One thing he WAS wrong about that you didn't add to your list... MM messaging. He thought people would just use email instead.