"But do you have any actual numbers?"
Do we need actual numbers?

I think forum's group + unbiased discussion elsewhere on internet is fairly representative of direction people want BIAB to take. In my view, there are two main categories:
Casual users citing: Complexity & GUI
Seasoned users: Known bugs, missing items of existing features, and gaps in workflow.

I am confident that if yearly update will focus around these issues it will make a lot of people happy.