Digging deep are we? Your 3 points laid out are just running rampant on the net with people's cameras just dying from the need to change batteries in the field. Let's put a bit of realism into our points rather than just making things up.
You mean things like digging in the snow for a camcorder battery that I dropped earlier this year when trying to swap it with numb fingers due to the cold?
How about having to go back and try to find camcorder batteries that weren't actually in the pocket of the bag I thought I put them in last summer?
Or maybe something like photographing in a near weeklong downpour while huddling under limited cover while out on a trip?
Or maybe getting sand and dust inside the camera while out at the beach and having a sudden gust of wind kick up? (That time was actually while changing film on a 35mm, but the principle applies.)
The longer you can go without having to open a camera up to change things, and the fewer 'spare parts' you need to achieve the job, then the fewer points of failure.