Where I am, it's taught you're actually supposed to favor your driver side alignment. There's a couple of reasons:
-
It's safer for parked cars and the odds of someone hopping into the lane (via car door or from around it) make pedestrian danger real. Same for bike lanes. Those on the passenger side are always more vulnerable on city streets.
-
You inherently have more control over the driver's side than the passenger side; same reason you're also supposed to pass slower vehicles on that side (trucks can see you better on their drivers side, although I feel like they mostly drive with mirrors for that).
Unofficially there's also: 3. Some intersections have an unspoken rule that you can allow right turners a lane if everyone favors the driver side line. It's typically a parking lane that ends, so it's not always as wide as you'd like. I'm not 100% on its legality, though.
Plus, let's be honest, nobody can be pure center. Luckily it mostly doesn't matter unless the roads gets really narrow; most highways in the US at least are wide enough where it barely matters where the fuck you are in your lane... although some pickups eat up that whole lane anyway nowadays so who knows, lol.
Edit: oh and the next generation might be screwed. My little sister who's ten years younger just lets her car's lane detection steer her wheel. Her car just fucking bounces from left to right to left like a game of pong. Absolutely maddening!