Why is the Little Swank door 3 tiles wide?

This is a question I've had for some time that I have yet to find a good answer for

That is the Little Swank door from Get Famous. Kind of cute, modern and utterly, utterly irritating. You see, that door which fits - with some space - in two tiles, is randomly three tiles wide

And that extra tile means that you cannot centre it on a three tile wide gap. We already have an annoying lack of narrow medium wall height doors which aren't obviously meant as front doors and a massive lack of narrow medium wall height doors which don't have glass in them. A two-tile wide one would be useful and this one should have been it.