Why is battery life an issue for you?

A recurring theme on this forum is battery life and some people even saying that they want to move away from m4/3s for better battery life. Some people seem to have sleepless nights just thinking about it. I don't really understand so perhaps you can explain why anybody would feel this strongly.

As I see it and assuming battery life is fairly consistent across all m4/3s models which I believe to be true:

I put a charged battery in my camera when I leave the house. If I am in heavy shooting mode. I will get 1000 shots from that battery. If I use all of the battery charge. I change the battery which takes about 10 seconds. I'm unlikely to want a third battery with that type of usage. Whatever camera I owned I would expect to carry a spare battery so in that scenario m4/3s would be no different to anything else.

If I am shooting much more lightly I will probably get 300 shots. If I am shooting lightly then 300 is probably more than enough but I will always have my spare battery just in case. The only concession I would make is that if I can see that I am not likely to use the camera for the next half an hour or so, I will turn the camera off. Most if not all of the cameras I have owned in the last ten years actually power up from cold quicker than they do sleep.

I go home and the next time I go out I put a fully charged battery in the camera and one in my pocket. Now what could be simpler than that.