If you still don't get it, for example, the bow is always in the 4th Hotbar slot when u respawn. I like to have the bow easily accessible, so I'd want it in the 2nd slot so I don't have to use the 4 key and I can just use my mouse to scroll to it. Or, I've hotkeyed my 9th Hotbar slot to the key R, so I'd want to put blocks there for easy access. If I wanted to do that, I'd have to move the items around every time I respawn, which is annoying. So what Pie is saying, is let players choose where items appear when they respawn so that they can have easy access to the items they prefer for their style of gameplay.