They probably made 1000 bets on how to do things and won 99% of them - the remaining 10 steps turned out to be manufacturing nightmares. If they knew beforehand

They probably made 1000 bets on how to do things and won 99% of them - the remaining 10 steps turned out to be manufacturing nightmares. If they knew beforehand what wouldn't work (and you never know that beforehand but afterwards it's easy to point out) they would have designed their manufacturing line differently. Now they lose a lot of time, need more space and workforce but probably will get there anyways if money doesn't run out in the meantime.