Why would you suggest such a dangerous situation?!! Don’t you know if you were able to use the mouse while plugged in, then many people would leave it plugged in all the time, leading to the battery not charging properly and possible resulting in an incendiary condition that could destroy everything and everyone that you love?!! Only Apple has the courage to protect their valuable source of services revenue by protecting their users in such a brave manner!
Apple very often prioritise astethics which is great. Just look at how ugly some of the hybrid mouses look while being wireless. Its beauty is comparable to an American strip mall.