For me, it may be that the toilet paper roll needs to have the open end away from the wall. I don’t want to reach under the roll to take a piece! That’s ludicrous!
That or my recent addiction to correcting people when they use “less” when they should use “fewer”
If you think about it, that’s following the rule on the footpath that would otherwise be there. That edge would be towards traffic, it’s just reduced to zero width.