The mechanisms necessary for a removable battery that doesn't fall out accidentally cost extra weight and bulk. It's an engineering tradeoff, and swappable batt

The mechanisms necessary for a removable battery that doesn't fall out accidentally cost extra weight and bulk. It's an engineering tradeoff, and swappable batteries aren't worth it for many users. This is also why many laptops have fewer interchangeable parts- for many people, being lighter and thinner is better, and a 3-5 year lifespan is plenty.