> Are you prepared to do some very very fancy statistics?

I'd extend this with "... while understanding what you're doing?"

I've seen it so many times already, someone does some A/B-test and then presents a very fancy looking slide-deck with all kinds of crazy-looking math. But if you start to ask questions, it's all very obvious that they didn't really understood what they were doing and that very often it doesn't really matter to them in the first place; it's all about reaching a decision using some pseudo-scienty method that nobody dares to question because 'data' and 'science', without having to take responsibility.