Why would you ignore it, you will probably end up removing the steering wheel to realign it anyway, as he is changing the rack and pinion you would lose your matchmarks. It is easier just to put the steering wheel back on straight after getting the wheels facing forward, or isn't it multi splined at the steering rack.
In my line of work, the faster you work, the more money in your pocket. Less work = more money. LOL
The racks usually come centered and I hold the steering wheel centered by the seatbelt. Minor adjustments are made with the tie rods.