A chore shared fairly includes the part that happens after the obvious action is finished.

Most household tasks have a visible middle and an invisible end. Cooking includes deciding what to cook and putting the pans away; laundry includes noticing the basket was full in the first place. When one person does the photogenic part and another quietly does the setup and the aftermath, the split can look equal on paper and feel lopsided in the house. The unfairness lives in the parts nobody names.

Pick one shared job and walk through the whole arc of it out loud, from the noticing to the last thing put back. Divide that, not the headline task.