Open loop doesn't always have to occur at WOT. There are functions that control open loop based on a number of different factors, most particularly load.
The WOT multiplier controls how far the fuel adjustment can go in order to achieve desired AFR for peak torque. This is more of a limiter in the sense that it won't allow any fuel adjustment beyond a certain point. Outside of that, the main fuel tables are what offer final adjustment of open loop fuel while the MAF sensor provides the air mass values to the PCM so the PCM can have a base to maintain the target AFR of 14.64:1 in closed loop. Short and long term fuel trims take care of everything else.
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