One shelter that fits two adults and their bags, and a sleep setup where nobody borrows the other person's warmth. This group decides tomorrow's mood.
One cook, one wash partner, and capacity for a proper dinner without a market stall. The kitchen is the evening's stage; keep it small enough to own.
Two people make more decisions per day than one, and heat doubles them. Count the water once, together, and put the shade up first.
A well-lit site in the wrong register becomes a car park. Two lights that warm the evening and one on each head keep the night civilised.
The unglamorous group that ends arguments fast: first aid, fire cover, and one written plan both people have actually read.