Well......you said it......
The comments on this thread have had an amazing lack of reference to one spouse outliving the other by many, many years. Perhaps the surviving spouse remarries..........a couple of times.......lives to be 105.......has new dependents.......etc.
Isn't anyone interested in having even a small portion of their current assets directed to some legacy at the time of their death if they predecease their spouse?
The duh was in reference to my poor communication. Ooops! But you point is well made, especially if you have children. Another use for a bypass trust.