You are missing something. Resolution is the feature size on the ground that can be resolved. So (to simpiify) if it's 0.5m resolution, and I have some much smaller, but bright reflector on the ground, you will see it blurred out to look 0.5m wide. It could be a couple pixels wide, it could be a thousand if you want to up sample it, the point is you won't see small stuff. This is why pixels are not mentioned