I'm even crazier, MM. I prefer to adopt teenage dogs! My previous dog was just over 1 and my current dog was 8 months when I got her. And boy, did she chew and destroy stuff! But no leadership challenge though, she is an awesome dog. I prefer taking a young dog because I still think they are somewhat easier to mold at that age. And I just enjoy knowing them in their monkey years too. Now she is about 16 months and I am still hoping she will grow out of some of the annoying habits we haven't managed to break. But she is definitely less determined to destroy our belongings and I love her all the more because we got through that together and I didn't kill her over it.
Yes, pups are hard work, but committing to dealing with those issues strengthens the bond also. Though personally, I always preferred to not take on a very young pup because they require more supervision and guidance than I have time for. I would not have been able to leave an 8-10 week old pup home alone for more than a couple of hours, for example. But my 8mo coped well with it.
I enjoy seeing them change. Watching them grow from pesky adolescents into balanced adults. I might consider once taking on an older dog as a second dog, but I would do it more because I know how difficult they are to rehome than for my own benefit.