These devices use so little charge that they basically need no charging. You can literally do it once a month for a couple of minutes.

The justification is not having any messy cables on my desk, where space is a premium and mess distracts me.

The problem is you forget every time so once a month you are in the middle of doing something and you have to stop, turn your mouse upside down and then wait.

You get a "low battery" warning that pops up when it's got a day or two of charge left so it's fine.

Don't need to stop anything, just plug it in at your next lunch break or when you leave for the day.

It's just not really an issue as far as I can tell.

The only way you can run into that is if you have a three-day meth burner (so, no breaks where you can charge the mouse), ignore the three days of low battery warnings, and then use it right up until failure yet be outraged that you don't have 5min to spare (meth will do that).