Synth durability has NOTHING to do with the final products durability. It is the integrity of the ingredients during the synth. 100% complete is 100%. 100% is one whole. One whole item is a whole item which is a whole item not a 'broken item'
What your saying is when you finish a synth with 1 durability it is a POS item. If you finish a synth at 100% then you should get the item period.
What they need to do is re-calculate the final synth and if its durability hits zero have it display 99% on the screen. I could live with seeing anything but that 100%. hell make is say 99.99% i don't care.