I’m sure if bigger batteries sold better there would be more (any) options. The issue is not enough people care.

This in my opinion is only true to some degree. The real world doesn’t reflect the idealistic demand->supply concept, and instead there are many other factors that play a role. There’s the reverse supply->demand effect aswell, where companies especially through marketing steer consumer demand into the direction that suits them.

The issue is not enough people care.

Here the big issue is that not all qualities are equally easy to experience.

When you go into a store you can immediately see and feel the effect a larger, brighter screen or a thinner device has, the difference in real world battery life for your own specific use case is impossible to quantify. Even more so when asked to extrapolate it into the future and factor in degrading capacities. You can’t even directly translate a concrete number like the mAh size of the battery into it, since hardware/software efficiency and useage patterns can distort it substantially.