I am genuinely interested in the subject of single file/two abreast riding. If you ask car drivers they all will claim that two abreast is an ignorant way to ride and not considerate of other road users. If you ask cyclists some will agree with this and some will not.
So a simple question: If two cyclists are riding two abreast does this, in your opinion, have any effect on a car driver's ability to overtake compared to riding single file? If the answer is no, why do you think car drivers disagree?
No agenda here, a genuine question as two road user groups appear to have very different positions on this