Yes it's sad. But its removed from its source. You may have some very light touch sensation across the entire breast but thats it. Mostly it becomes numb is my belief. This article suggest some women retain sensation.
I know my sensation was felt deep into the breast tissue which was removed. I have some light touch (think of light tickling) sensation of the skin across my reconstruction and even nipple reconstruction. I guess these are the conversations to have with your surgeon. Most try to preseve the nipple if possible even if only for appearance.
https://journals.lww.com/oncology-times/Fulltext/2015/05250/Preserving_Nipple_Sensation_after_Breast.14.aspx
