“Simplicity” I guess. Use your phone charger instead of going to the store to buy batteries.The problem is it doesn’t make sense why they would care if user use it while changing? Why even change it from AA battery you change once a year to charge for 5min a month?
And putting the port on the underside? The older version at least you could replace the battery and as wireless charging function in its place. Nothing was gained with the new one