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Cheers @mdcc_tester, that makes sense. It's also a good test of whether your stem bolts are tight enough i.e., if tightening the pre-load screw after the stem bolts causes the steering to stiffen up then your stem bolts weren't tight enough. I guess in normal use the stem would turn on the steerer before it would work its way upward, but I think the fear is that if the steerer is too short then the stem-steerer interface could become slightly conical and work its way upward, so tightening the pre-load would definitely help.
Fiery deathballs, but you can probably delay that past the end of your natural life by using this one weird trick