The problem with the FAB (some would say there are many) is that often you want to be able to invoke actions on an item in a table view. The fact that that has been precluded with this design is surprising, but the fact that they don't even mention it in their ridiculously scant spec doc is laughable.
So if I have a table of items, say I want to do the simplest thing imaginable: just include a button for each item to mark it completed. You are not supposed to do that. I guess a TODO app interface might work, where I add a checkbox and then train people that that's what it means. The MD idea is that tables should be informational and all changes should be done in detail pages.
Interested in any ways people have tried to deal with this. Thanks.