And I would guess that there are innumerable things that neither of us would WANT to know about, either.
Yes, and sailboat racers got along just fine without bulbs - or wings, for that matter - on their keels for hundreds of years, but if the designer thought the craft needed one, and the manufacturer was enough in agreement that they tacked one on, you won't find many skippers that'd leave the safety of the local pub to head out to sea without one, especially having just lost it in a collision, and I'd be surprised to find a pilot that'd do otherwise.
But then I've never been to Sri Lanka, and have no idea what goes on in their pubs.
And I would guess that there are innumerable things that neither of us would WANT to know about, either.