You said 1 luxury per city. When you put forth an objective claim, you are also saying 1) there's such a thing as truth 2) there's such a thing as falsehood 3) truth is preferable to falsehood. To that end...
If a lux provides 4 happiness and a city only provides 2 unhappiness (3-1 for Meritocracy), then that would be 1 lux per *2* cities. Since YOU acknowledged that truth is preferable to falsehood, the correction should be welcome whether you feel it is relevant or not. To resist such a correction is to confess that you're more interested in somebody just believing what you say rather than being able to convince them with logic, reason, and evidence. Even after you had done exactly that. *scratches head*
Whatever I'm too tired to nitpick over this.