The recommendation for replacing the spark plugs is not a gap issue. The platinum material will not wear as the old spark plugs from 30 years ago.
The replacement is necessary because the porcelain gets contaminated with the combustion residues and this contamination reduces the efficiency and performance of operation of the spark plug. This contamination will affect the combustion quality leading to misfiring. The recommended interval of 105K miles is to keep your NISSAN operating at top condition.