The life span is not going to stay the same. Adding more capacity yield more time in air, it's just that the effect is not linear.

Not exactly. They are increasing energy density. So for the same mass they are providing more mAh. More charge. Equal weight. Equal motor. Equal consumption. Longer flight time.

This doesn't really impact sUAS because they are already using pocket cells. Larger things that use jellyrolls, but need a better packing factor or would benefit from not carrying around all of those capsules and button tops are the target here

that is essentially the rocket equation: More fuel - > more weight - > more fuel needed, etc. It is a balancing act.