The mechanism that lets output hold is the elimination of wasted work time (meetings, interruptions, low-value admin), which is abundant in much white-collar work but scarce in blue-collar, care, and coverage-bound work, where compressing hours can instead raise pace, errors, and safety risk.

Evidence (1)

Four-day workweek (overview of trial findings and sectoral limits)

Gains come mainly by eliminating wasted work time; experts question feasibility in blue-collar work where there is little slack and workers may have to work faster, raising stress and lowering safety.

https://en.wikipedia.org/wiki/Four-day_workweek

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