I was referring to 'real life', as in Child's post, Helen
But if one takes pains to dig it up, it may be seen here too. More so in RPGs, probably (though I do not play those, regrettable lack of time
and imagination), but maybe it is explicit there in more literal way - without A's post the B's post would have been different, etc. But principle seems similar. And remember notorious Canonicity thread - without everybody posting, everybody would cease posting. But both examples fail short of the mark, it is more subtle, and I can not grasp the suiting analogy (BTW, another feat H-I is marked for more than GL - giving analogies for everything he says (writes))
So better remind myself of another great quote by J.R.R.T. - 'things might have been different, but they could bot have been better'