Knock Sensor is a global safety device - against 'blondies'. Typical car usage never activates KS in a car lifetime. However, these sensors degrage soon causing power loss & poor mpg.
It may be bypassed with 1c resistor - and no harm done (except Nissan enterpricey). The requirements for driver iq are higher w/o KS: he/she has to understand to loosen gas pedal 5mm - during knock which may happen "once in a lifetime, hot summer year 2035". Example for all, Details for 3gen VGE maxima click
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Nissan Service Manual -94 page EF&EC-21 says this: "The retard system by knock sensor KS is designed only for emergencies. The basic ignition timing is pre-programmed within the anti-knocking zone. Consequently the retard system does not operate under normal driving conditions. However, if engine knocking occurs, the knock sensor monitors the condition and the signal is transmitted to the ECM. After receiving it, the ECM retards the ignition timing to avoid the knocking condition."
Having said all this, its good for general pop to keep KS & any other safety device up and running.