Nope! The upper fan leaves allow the plant to use light to convert sugars to energy. Also, in the last few weeks of flower your plants might stop taking nutes through their roots and rely on the energy that's stored in the fan leaves to finish flowering. That's what mine did, and that's what produced the beautiful fade on the upper fan leaves. That's also what allowed my bud to fill out in the final weeks. No fan leaves, no filled out bud.
Now, if you want to tuck some leave out of the way, go ahead, I was tucking all the time. But definitely keep 'em!