I've never understood the idea that moving left will magically prevent close passes. It might if there's approaching traffic, and passing between you and the oncomers is physically impossible. But if there's room to pass, drivers here will pass with roughly the same clearance wherever you are.

So all moving left does, is making passing more dangerous for everybody by increasing the distance the driver has to move left, and the time before he can come back into the lane.

Maybe this is an East/West thing, and maybe drivers out west treat lanes digitally, either changing or not. But here in Metro NY area drivers are more analog and take lane markers as only a suggestion. They have no problem flowing around cyclists, and it's easier for everyone if they only have to flow half a lane across.

This isn't to say that I suggest curb hugging, which would give no room to maneuver, but to remind people that the roadway is a shared resource, and it's possible to share it safely to everyone's benefit, including your own.