The folks at T4R ran this down when the 5th gen came out. Toyota's response was that they had updated the telemetry sensors and the algorithms that manage the SCAB to the point where a kill switch was no longer needed. Meaning, it won't go off unless you roll.
One could argue that some rollovers don't require a deployment, but that's a fine line. I guess they drew the line at putting your truck on its doors.
No Toyotas from 2014 on have the the button.
I thought the objective was to give the operator the option to disable the side curtain during predictable conditions likely to cause an extreme lean or in the event of a slow roll when the airbag would not be needed, again, based on the choice of the operator.
Maybe Toyota improved the algorithm or just decided to take the option away from the driver.
BTW the 2014 FJ still had the button.
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