Every board I have bought in the last 10 years came with the I/O plate.
As for taking a hammer to getting the old one out and the new one in is a serious bit of overkill. The I/o plate is a press in flange. You just have to get one side of it started and it just pops out. Just press the other one in and you're set to go. If any more force than just your hands is need then a tap with a screwdrive handle is better than a hammer.