It's not totally unusual, there have been threads about it here before. I tend to keep a few questions up my sleeve so I don't come across as completely witless when a member of the flight crew come through brandishing iPads.

The TellBA surveys do cycle between different aspects of the flight experience. I reckon it is something like 60% lounge focus, 25% cabin crew focus, 10% airport focus and 5% flight crew focus, very approximately,. I haven't kept a proper tally. This is on the basis of going for the full survey from the smartphone link rather than the 3 question text replies. For flight crew the usual questions are along the lines of "did the flight crew make welcoming announcements?", "did they appear at the door on departure?".