Aesthetics. That and the acoustic boards are 600mm wide and very expensive, so 400mm centres would mean lots of wasteage.
2400x1200mm sheet sizes so the boards span over the joists anyway? 300, 400 or 600mm are all standard spacings for that reason.
Acoustic panels go between the joists.
@leggy_blonde started
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Aesthetics. That and the acoustic boards are 600mm wide and very expensive, so 400mm centres would mean lots of wasteage.