Things like this dumb mouse and how it is created are most likely created like that on purpose. Not sure what that purpose is, but it is. I’m pretty sure a massive company like apple know this is a very dumb product.
The purpose is they don’t want users to leave the mouse permanently plugged in. That would leave an ugly wire to their beautiful wireless product. in my opinion the only pointing device apple ever got right was the trackpad. Their mice have been absolute crap since the iMac g3 hockey puck mouse days. During the G4 era they had that transparent pill looking mouse, then the pill with the ball scroller that would collect hair. Then magic mouse and now this. Consistently bad since the early 2000s is actually quite impressive.
But why not add at least something resembling a reasonable charging option? Like a QI mat, a magnetic holder/charger, etc.
You could even add extremely low power charging to the flanks of the keyboard, so that it charges by being close to the keyboard.
Desktops in general don’t make sense for apple. it would only make sense if they were a tech company but they are not they are a Luxury Fashion company. it’s not about what you do with your computer it’s how you look doing it. Apple has more in common with Louis Vuitton than HP
Leaving at permanently plugged in would  destroy the battery life. That’s why.
That could easily be rectified by proper battery management firmware
Just charge it one of the 10 times it tells you the battery is low as you leave the office, and you won’t have to deal with it when the battery actually dies. It’s not that complicated.
