My view is, definetely check!
You can't take for granted that the person at the factory is going to be 100% correct every single time.
We don't know if that person is having a bad day and simply wants to fudge one plug and not care.
Not all cars use the same gap anyway. Ford uses like .054" and GM uses .060".
If a plug is gapped to wide, depending on the car's spec, you could eventually create a misfire condition.
Also as an example, say an old '81 Datsun 210 uses an autolite 64 plug, the gap should be .044".
Say an '84 toyota pickup 22r, uses the same plug: gap: .032"
(these were friends cars back in the day, when I was 16 and found it odd that 2 different mfgr's used the same plug).
What's a few minutes to check the gap and possibly adjust? If anything, for sake of mind.