Things cyclists should know … POV driver who's incapable of cycling

Cyclists riding one behind the other without break can form what needs to be considered as one entity when it comes to overtaking, and that line of cyclists can be far longer than any motorised vehicle on the road. Is it completely unreasonable to mention that something like this is extremely difficult to overtake in a safe manner?

How often does this happen?

Perhaps you need to learn some patience for the very rare occasions that you encounter a stream of cyclists longer than a juggernaut.