I bought the Krytox grease, and have applied it once. I use the moonroof frequently, and have had no trouble with it. It is a 2018, and it is over 3 years old.
https://www.fordraptorforum.com/threads/2-bolt-slots-tailgate.74705/page-2#post-1454975
It is to limit lateral movement of the tailgate while stepping on the step.
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