We'd probably do just the opposite. If it was really good, and IF the servers appeared to have the time (that's important) for a special request, we would order a second. If they were out, that meant others got to enjoy the dish as well! I would hate to order a popular dish, decide we didn't like it, and let it be wasted. Missing out on seconds isn't
DCL "tying our hands" but life happening.
But...we are pretty forgiving eaters, the MDRs are great fun, and we will happily eat ANYTHING we've ever seen on their menus. We have never had anything that was awful