Tom,
I agree that the number of transmission on the road increase the odds of failure, however the 2-3 shift surge has been a problem all the way back to the 4 speed version of this same transmission. Ford is aware of this because the added a specific sensor to the new 5 speed version specificly to detect the speed of certain gear sets during the 2-3 shift and create a blinking O/D and error code. That proves that Ford knew about the problem and that the problem still continues.
Besides the problems reported here, a search of the web for the 5R55E transmission gives me over 100 sites related to the transmission and many of them discuss the 2-3 shift surge that everyone complains about. Ford is just rolling the dice that the problem will not show up until after the warranty has ran out since most complaints occurr at 50K miles or above, with some noted exceptions. If you consider that replacing the valvebody,and/or solenoids would cost about $450 per vehicle and over $2000 for a rebuilt transmission.
I think the recall for the additive for the 2004 models was a stop-gap measure by Ford to help reduce and delay the future warranty claims until after the standard warranties had expired.
What makes me even more suspicious is that the symptoms of vehicles that did not receive this additive or wrong fluid were forward or reverse gear would not engage or there was a delay in shifting into gear. There are very few reports of this problem here or at other websites, but plenty of the 2-3 shift surge problems which were conveniently ignored.
...Rich