There a few reasons to use a secondary and your stout doesn't fall into any of them but I wouldn't want to bottle a stout on day 14 either. I'd prefer to wait for day 21 or even day 28 to bottle because you have dark grains in your stout that take quite some time to mature, for the flavors to all come together. Being on the yeast cake can help speed the process of maturation. Even with 28 days on the yeast cake your stout will still take more time yet to get really good. Expect 2 to 3 months to hit its peak flavor.