The wind wants you to improve - it wants you to be able to storm over a fallen tree, without hesitation. Logs are opportunities, not problems. Each has its' own reason for being there, and maybe one of those reasons is for your skill improvement - trail crews however are quick to cut them up and take them away - removing that technical skill development opportunity.
My point is, go towards the challenge so you can discover your weakness, work with it. Soon there won't be much mother nature can do to cause you to get off your bike - just hope that the trail crew didn't find your challenge before you had a chance to challenge it! And know that if you decide not to try, you may have passed up your last chance at that unique practice opportunity. Ride ON!