^ Yes, the Delete All Data was a feature I used a ton of the time.
I like that there is now an option to select a group of rows, then 1-click delete that set of rows. But you still have to click each of those rows one at a time to select them.
But more importantly, those of us who draft our quizzes in Excel (and I do that for all of them), and import them, very often do early assessments, decide to delete everything with one punch, go back into Excel and do our editing and revisions a different way, and then re-import.
I also will draft the first third of a quiz in Excel, see how it feels and whether its on track; then delete all of that, and go back to Excel, finish the quiz and import the whole thing in.
This is because there is no way to import just part of Excel Data into a specific range of rows. It's all-or-nothing to import it, and thus I'd love to still be able to delete all data at once, to "clear the way" for the next import.