The IPP is definitely the go-to device for productivity. It will NEVER compete with a real laptop computer whether it be Windows or OS X. the reason I say it's the go-to is due to the screen size and split view being completely usable. On the other 10" size iPads it's very difficult/a lot hard to work with split view and just feels cramped.
You can think of IOS at its current state to be maybe 90-95% replacement for a real computer. You have to decide if you want security or flexibility but not both. All the apps are sandboxes and you will indeed have to copy and duplicate files in each app to get around the lack of a real file system but that provides security and personally I don't find it that compromising. Just have to do 2-3x the steps to move files around. You can just use iCloud but I have multiple NAS drives and file shares on my network so it requires FileBrowser/documents/PDF Expert to move stuff around. WIth the locations extensions you can definitely work with files outside of iOS.
The only things you cannot do at the moment are: software development, working with large databases, opening TWO of the SAME apps side by side (like two excel worksheets), encrypting files, and things like recording screen, watching TV, stuff that you do on a typical computer. There will be apps that can do this but then you need iOS to open up those API for these apps to happen. Right now it's as if Apple is trickling API functionality bit by bit and probably will take like 3 more revisions to get close to that 99% laptop replacement.
I personally do not mind opening up files from FileBrowser and the like and having to duplicate it around I just go back and delete those duplicates after I'm done. I also have a cheap 50GB iCloud account just to not have to always move stuff around too much unless it's stored on my NAS. People who doubt productivity on an iPad pro is just making up excuses. Sure it's more tedious but it's definitely doable and I love the fact I get full security on my iPad pro.
The iPad pro is just fast enough to really replace my laptop but yes there is that 5-10% of the time I need a real computer to complete the job. Otherwise the IPP is my sole computer.
Edit: you can always get a Remote Desktop app to remote into any pc/Mac. So I guess you can really replace the laptop![]()
This all sounds great but it would be a lot easier if apple simply opened up the two operating systems for better interaction...rather than everyone making great work-arounds...