If the wings dried out, it would be uncomfortable at the very least for the sprite. Painful, if it got bad enough. The wings are very sensitive to the air around them, so if they were dry and more brittle than normal then the poor sprite would be very sore. Of course, not being able to photosynthesize as efficiently would be a side effect, leading to fatigue and other related conditions that would make life harder for them.
As for Bowman’s fussing about his wings, he tends to go above and beyond what’s strictly needed. He might be willowy and lean, but he’s technically an athlete by their standards, so he keeps his wings stretched and fit. He preens regularly to massage the overworked joints, and he takes every opportunity to put them to use.