Getting it in the (tiller) neck
Is there a mechanical or ergonomic advantage to the swan neck shape of the tiller? website to achieve if the swan neck ran straight up from the rudder stock and then turned through a right angle. The gap between rear bulkhead and rudder stock would be too small. By sweeping the upright part of the swan neck backwards and then making the bend gives the length required for the un-pivoted section or the part the separate tiller bar slides over while keeping much of the small rear deck free of obstruction.
On butties, where the equivalent of the ‘upright’ part of the swan neck is just a wooden extension of the rudder, the whole tiller bar lifts out of the rudder and is replaced the other way up so the bar sweeps upwards to clear the rear access. You can occasionally see a swan neck that is vertical with a right angle bend on an old cruiser stern but they look very odd.