I knew you'd say that, hence why I stated that it only matters if you think centring the steering column is critical.
Of course, centring the steering column does make a difference, but only a small one at the levels of error we are talking about. Taken to the extreme, imagine setting the steering such that with 0mm toe and wheels pointed straight ahead, the pittman arm was 90 degrees to the left (forget that the track rods would foul on the column for now). When you turned right, the outside wheel would turn left (you can already see this type of behaviour on a normally setup kart) and the inside wheel would behave similarly.
Essentially, by not centring the steering you're giving different turn-in rates to each wheel (the wheels turn quickest at the centre and slowest at the extremes (to the point of turning the wrong way).
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