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The 'fitness function' they used was time only. Doesn't consider/weigh the cost of bad assembly (trolley falls on your kid spilling boiling tea everywhere) etc.

I can assemble that trolley in 5 seconds - throw the parts in a pile, Done! Some errors of course.

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You gotta read the article, they rate the quality of construction.

The study did look at build quality.

"In terms of construction scores (from 1 to 10 where 10 represents a perfectly built trolley), men averaged 8.9 with instructions, 7.6 without; the women averaged 7.5 with, and 5.7 without."

Ah. I skimmed too quickly. So, a clear advantage to the men.

Funny the article ends up with some pap about 'men and women can benefit from clear instructions' where the study showed that to be false.

But it didn't show that to be false. The comment you replied to proves it.

But men gained only a few percent improvement with instructions...

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