I have seen reports of some velomobiles being a bit too sensitive at speed and the video of one almost going under a truck seems to "smell" of too much correction. Many with so-called tiller steering don't seem to have much steering room inside them but, there may be two parts to their steering.
Tillers are usually operated by moving from side to side, yet tiller steered trikes, some at least, have a universal joint at the bottom of the steering shaft allowing the column to lay down or be moved out of the way for getting in or out. Does that provide for column side to side movement for relatively straight riding and minimal direction change response and column rotation steering for tighter corners with much more direction change response? Of course, when you suddenly need it, you grab what you can at the time - with whatever results that you get.