I keep my watches in winders as I could just pick up whichever piece that I want, at any time, and the date and time would be properly adjusted. And more importantly that the little convenience, was that a watch that was kept wound as per specs, should self-lubricate and thus kept the gears in good working condition. The lubricant would be more prone to hardening over time if the gears were not kept moving. Therefore, having watches in winders should keep them relatively more maintenance-free compared to having them lying around for months to end.