
The hairs are naturaly made by the plant and are called trichomes.
The “hairs interfere with the feeding of at least some small herbivores and, depending upon stiffness and irritability to the palate, large herbivores as well. Hairs on plants growing in areas subject to frost keep the frost away from the living surface cells. In windy locations, hairs break up the flow of air across the plant surface, reducing transpiration. Dense coatings of hairs reflect sunlight, protecting the more delicate tissues underneath in hot, dry, open habitats. In addition, in locations where much of the available moisture comes from fog drip, hairs appear to enhance this process by increasing the surface area on which water droplets can accumulate.” wikipedia
The stinging spikes of stinging nettles are also a type of modified trichome which is pretty cool
I would say it would be fine, the only problem would be warping as the pine will be quite thin (plywood is more resistant to this).
But if you don’t care about everything being perfectly straight I think pine would be plenty strong enouph and wouldn’t warp noticeably much either (just pick straight boards from the store). So yea I think it would be fine.
P.s. (if you join multiple boards together its usually less likely to warp but I don’t think this is necessary for your usecase)