The world isn't a binary place where there is always a right or wrong way to use the road. A bit of common sense from all road users makes like better for everyone if we ride/ drive to the conditions.
I quite agree with this in principle.
Unfortunately cyclists, drivers, pedestrians - humanoids in whatever context of conveyance - will have varying levels of relevant knowledge, experience and skill. And we are all vulnerable to misjudgements, impatience, ill temper, distraction etc, which is where a reliance on common sense becomes a sticky wicket.
I personally am happy to single when riding in a group in order to cause minimum delay/frustration to drivers, and our cycle club encourages this on rides generally, depending on the road conditions and the size of the group. But to come back to 'common sense', for me if one road/group is both more vulnerable and less potentially dangerous to others than another road user/group then to me common sense is to give the more vulnerable/less dangerous user/group priority when it comes to road space, regardless of possible delays/requirements for reduction in speed from others.
No one is going to overtake when another car is coming that would be dangerous whether riders were in single file or riding two abreast.
This? Poppycock. If you honestly believe this then you must cycle very rarely or in a part of the UK that is totally unique in terms the proficiency and considerateness of its drivers.