They still have to hook up one at a time. The bomber can handle one at a time, but it cannot fly unbalanced for long, unless it compensates with rudder.

And in combat or even peacetime ops, one may be lost, and to return the bomber would have to fly back with just one, with the other wing empty. The result is you can fly with two escorts, but you cannot use just one, you have to deploy both, whether you need both or not, which makes the configuration awkward and unflexible.

Its a lesson engineers are prone to forget. Just because something can be made to work, it doesn't always mean its a good idea. And in the event things don't go exactly as you planned, the extra complications can make it really cumbersome. The extra capabilities are paid for with the price of increased complexity.