I think you must make a distinction between slide on ferrules and crimped ferrules. I guess (and its only a guess) Bob is talking about slip on and leave it, that's the most 'conkorzy way'. The factory had the advantage of ferrules just right for the tube they had back then and needed nothing else. of course any one who has some correct diamond pattern hose nowadays is on the last knockings, as they stopped making it18 months 2 years ago and the cleverest cad cam. plastic rolling. rubber masticating, 3D printing anorack hasent worked out a way of making it yet.
I must admit the slip on ferrule method does work with the right size hose for fuel, as the crap they call petrol nowadays gives some swelling, but who knows for how long?