We at calcbench couldn't agree more with your conclusions. We've done a tremendous amount of work in the space. All of our focus is on XBRL based analytics. Our users can access the footnotes and drill into them and get actionable insights out. Here are two examples:

1. Pick the operating leases report from our research page (published May 2015)

https://www.calcbench.com/research

2. See our blog post on an interactive version of XBRL for the footnotes. It's our version of "in-line" XBRL.

http://blog.calcbench.com/post/118967602578/interactive-10ks-and-qs-xbr…

Thanks!
Pranav Ghai