The real goal is not equality on paper but shorter care motions

Many parents naturally want to rotate for fairness.

On long Xinjiang routes, the more practical test is who keeps the child-side motions shortest and most repeatable.

One fixed caregiver often stabilizes the cabin rule set

When one parent stays in that role, item placement, stop routines and child expectations all become more predictable.

That predictability removes many small restarts throughout the day.

Rotation helps only when the route tasks are already clearly segmented

If one segment is long and demanding while another is light, or if the main caregiver is clearly getting overloaded, rotation can improve the day.

In that case, rotation serves the route task instead of serving symmetry alone.

What hurts most is repeated last-minute seat reassignment

Family days become messy when every re-boarding moment requires a fresh discussion.

Too many seat changes usually reduce the efficiency around the child seat instead of improving it.