Without a doubt. When I took a Windsor chair class with Curtiss Buchannan we were supposed to make the tops of our chair spindles 3/8". I screwed up and made mine 5/16". They look really thin and spindly. He said he wasn't sure how long they would last at that size. That was 18 years ago. That chair is used every day at our kitchen table.
I had to make some 36" long spindles to replace brass rods in an Antique piece for a friend. It was for a hand and coat rack off of a train. I rived the wood before turning it. They really are flexible but have not broken.