I see your point smett72, but…
define long queue
define slow
define safe place to pull in
and if you’re in a group, even when riding together, you’re still individual riders and communication is not always possible/easy.
Like I said, our club, and most others, will do this, but it is actually quite tricky, and just because you see a layby doesn’t mean it is appropriate or possible to stop in.
I completely agree that it’s not always easy/appropriate/safe to stop. But in the interests of trying to be considerate and not antagonizing other road users I would like to see people try.