The logic required as far as the pilot is concerned is quite simple. The pilot tells the aircraft to stop by retarding the thrust levers and once that is accomplished, the aircraft will provide as much assistance to the pilot to stop as is desired.
As far as I can tell from this thread, pre-Taipei the instruction with 1 reverser inop was to pull *both* the thrust levers to idle and then select reverse on the lever with the functioning reverser. For whatever HF reason this led on rare occasions to the pilot pulling only 1 lever to idle, causing these long landings and unfortunately, this crash.
No doubt the investigators will be poring over this incident for a long time to come, but if the lever was left considerably forward of idle this is not a shortfall in the design of the system, the logic or the programming.
There are many different breeds of pilot and the A320 system, and its progeny have by now been around long enough for some pilots to prefer that methodology. These pilots would kick up just as much of a a stink if they were forced back to the yoke as the more traditionalist pilots kick up over the sidestick.