So here’s the thing. If we’re sweating the details, if we’re saying design is in some ways about how the thing makes us feel, then well…
This is ridiculous. It’s obviously ridiculous. It looks wrong, and was so absurd I at first assumed it was a joke image, or that someone had just jammed a lightning cable into the old version of the Magic Mouse. It’s obvious why Apple chose this design, and it’s not because it was the best possible one.
Now, I get the argument that says this doesn’t matter. The new mouse charges so fast that you’d only been staring at this lunacy for a minute or two before your mouse was charged. But Apple’s entire design brand is based on paying attention to details that logically don’t really matter.
How should it have worked? Well, maybe something like this on the far side of the mouse that you never see? (I’m genuinely terrible at Photoshop.)
If that’s too offensive for the purists, it’s easy to imagine a version where this end would lift up about half an inch, revealing a lightning port like this for one to plug a cable into.
A few people said, “But lightning cables are too stiff and too short to use as a mouse cord!” I have a solution for this problem, too: Fix that. And the end result would be that, while charging, the mouse would still be fully functional; indeed, this mode would still be so useful that a lot of folks (myself included!) would just use it as a corded mouse most of the time and only unplug when needed.
In conclusion, if your design decision elicits unprompted laughter due to its absurdity, the solution is not to explain, “Well, you’ll almost never see this ridiculous scenario!”