This article is wrong on so many levels! Or, you know, the author is optimizing for something else than what I am optimizing for. ;-)
> "House, car, work scenario"
To provide some context know that I live in a place where I've never even seen a car key that is intended to be placed on a key chain and where all offices have access cards.
So my key chain has only the house key. My other keys, which I almost never use, hang in a key cabinet with labels. No unnecessary weight to carry around, no ordering and orientation problems, great for keeping track of which key goes where.
Hope that helps! :)