Without our hindsight, nothing would have justified the additional weight and conplexity of a fuel bypass.
Weight, weight, weight...
Honestly, weight is really not a problem these days on commercil aircraft when we are talking of a few pounds, seriously.
Think of just a crew putting on a few pounds each, let alone big blokes Vs small blokes, or the whole pax... or just a gallon or two extra fuel - honestly, things are NOT that critical that it would come into a design engineer's decision when safety is an issue.
Complexity Yes, weight, No!
I've seen parts fail on light aircraft because ONE pivot pin was made 0.020 " too small dia. when to have made a 1" long pin twice that diameter would add about a gram - and people die
