I don't know about a "professional" opinion, but I can give you my input based on what I've read over the years. It had been recommended that older automatic watches always be kept wound because the older lubricants that were used in them could coagulate if the internal parts weren't kept moving. This could cause the watch to stop running altogether.
Thankfully, today's high-tech lubricants no longer pose that problem. There is no need to keep a watch wound if you don't plan to wear it for long periods of time. The creator of this website (may he rest in peace) stated this many times as well. Consider this - many watches sit in jewelry stores for months or even years before they are sold. Once they are sold and the buyer starts wearing them, they don't cease to function simply because they were sitting in a display case for a while.
I can tell you from my own experience that I have a watch winder that holds four watches, but that still isn't enough to hold all of my automatics. So, some of my watches go for days, weeks, even months sometimes without being worn or wound. This has NEVER posed a problem for me in any way, shape, or form. I have the winder simply for convenience (so I don't have to keep resetting all of my watches), NOT because I'm worried about damaging them by not keeping them wound.
Bottom line - I don't think anyone can show you evidence that failing to keep a modern automatic watch wound will result in damage. If such evidence exists I have never seen it or read about it.
Just my 2 cents....hope it helps.
