" I have yet to build a bumbike that didn't need it.
Chainline man......chainline."

ok; i'll give....Since I've only ever needed one bike, I havent had varying BB/chainring width issues. But I can say that the many wheels which have all been on the bike have all had perfect chainline (though some have needed a spacer). Never 'needed' to redish, though I have for cosmetics. Prolly would redish more often if I were a clydesdale.