Tough questions make you better IF you take up the challenge to answer the question earnestly. Think about all the tough questions you have answered in your life so far. From when you were in school to when you joined the society as a worker ant.
The more tough questions you tackle, the better you get at solving them. Some questions will remain hard to answer, but you will be less afraid of answering them. I think the rewards from getting good at answering tough questions are worth it.