I disagree, I use mine for document writing and any time I want to play with painting. I am trying to start to use it for OmniGraffle again - but I find that OmniGraffle on the iPad is a bit buggy…It's still not a computer and that is the reason it's been sitting unused for two months. I prefer to use my 16 "MBP or MBA. Both do far more than my iPad Pro could ever do. All I ever did on the iPad Pro was read books in the books app. That's all it was good for.
I think that making it more of a computer would make it better, but I don’t think that the window system is the problem, that has always been my contention. I suspect at WWDC that we might get a new windowing system but they won’t change the restrictions that make some workflows impossible…
I think the windowing system has distracted people, everyone gets all excited when they hear about a new mac-like UI but that won’t fix anything that is holding back the iPad.