I'm writing this post sitting in San Jose Airport. I didn't have any WWDC plans today so instead I arrived at the airport ridiculously early, found a comfy chair and did about a three hours of real work on my iPad running beta one of iOS 11. I did this not wearing my MacSparky hat but instead my lawyer one. I wrote contracts, sent and received emails (with multiple attachments no less!), tracked changes in Microsoft Word, scheduled meetings in Fantastical, took notes with my pencil in Apple Notes, and otherwise made myself productive.
It's still early days. This is the first after all. I wouldn't recommend loading this early beta on your production iPad. I know of at least one person that managed to severely crash his iPad with the beta. Also, the battery life running the beta is about half what it normally is. (That's normal for early betas.)
What I can say is that once iOS 11 releases, people that want to be more productive on an iPad most certainly will be. iOS 11 is very kind to iPad power users.