...telling me I have to wait for iOS11 when I clearly said I was running iOS11 beta 2 is just frustrating...
I understand your frustration. But what they're saying is you need to wait for the
final release of iOS 11. After it's out of beta. Everyone totally understands you're running iOS 11 Beta 2. You've made that quite clear. But they're saying that isn't good enough. Neither will Beta 3, Beta 4, Beta 5, etc. be good enough. It's not going to work completely correctly until the beta is over. Sure, Dropbox works today. But only in a limited capacity. When iOS 11 is released to the public, Dropbox will be able to update their app in the store that will enable full functionality. But until iOS 11 is released later this year, Dropbox is literally forbidden from uploading a version compatible with iOS 11 to the app store.
All file apps have been updated by the developers and support file in iOS11.
That's another point you're missing. Unless you're part of a private beta with one of those companies, you actually do NOT have an app that supports Files in iOS 11. The limited functionality you're seeing is just what's possible today with iOS 10. Once again, they're are not allowed to upload a version that is compatible with the beta. I'm sure they have a version in house that does support iOS 11 and are probably hard at work on it. But they can't release it yet.
Hopefully Files will allow you to copy files around and allow you to leave the laptop behind. But we won't know for sure until later this year.
For the record, I'm "in the business". Every day at work, I analyze, fix/update, test and release software. I've made a living doing so for nearly 30 years.