Besides better battery technology. A bigger battery means the discharge rate is lower. The amount of damage discharging does decreases as the discharge rate drops. I think there is a knee around C4-5. And of course the same amount loss in absolute terms is lower as a percentage with a bigger battery. Meaning losing 5kwh on a 30kwh battery is 0.83% vs 5 kwh on a 60kwh battery is only 92%.

Proper way to think of battery life is depreciation per mile. If a battery costs $8000 and lasts 200,000 miles, that's 4 cents a mile. If it only last 150,000 miles that's still only 5.3 cents/mile.