Prob too late and too boring to try to gotcha this.... but anyway when the moon is bigger or smaller and the sun bigger/smaller in the sky they dont always overlap. And in the cases where the sun gets too small, there's an annular eclipse.

Think about them being "perfectly" the same, exactly the same angular diameter in the sky. That would mean the moon would have to go further from earth at the time Earth was approaching closer to the sun (in January) and all in lockstep. To what, a meter in difference? I wouldn't put my house on it.

Tbf they are quite similar in size. For now...... one day that moon will finally fuck off a bit further back and won't be able to inconveniently block the sun when I am trying to use its lights to see in the damn day time. Goodness.