Well let me answer what was not asked of me....
Every night when I go to sleep I place my phone and watch in a
dock that I bought. I take it out in the morning, use it all day and repeat each night. I have no issue with battery life normally. Since I bought my watch there have been two occasions where the watch died before the night was done. My iphone6 (on iOS9.1 beta) has gone into power save mode once.
So for me extra battery would have been nice in these three occasions. Otherwise it really is a non-issue. There are much heavier users than I so I can understand that for them getting through the day may be more difficult. However, I believe (meaning I don't have a source at my finger tips) the only possible inconvenience for most users is simply plugging in the phone/watch every night while they sleep. For me even if you gave me week long battery life, I would still dock every night, because I don't like things just laying around. I like the look of them in the dock. So it really is not bad. Again, this is based on my experience with my use case. If yours is different then that is fine too. Your use case does not invalidate mine nor mine yours.