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Too much of the advice on this forum refers to situations in which you have no reads whatsoever and no indication of how your opponents play.

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This is certainly true, but in most circumstances is just the way it has to be. Either people don't post reads, or the reads are vague enough to not be that useful. Even in this thread, when joewatch said that the table was loose/passive, was this on all streets or just pre-flop? I certainly see a lot of tables where pre-flop hand selection is pretty loose, but where play tightens up and gets quite aggressive as people play through the streets.

Given the lack of reads, a lot of the advice here just boils down to variations on the mathematically correct play given the range of hands indicated by an opponents betting pattern. I guess this is what makes answering such posts tedious for those who have been here for a long time.

But you are right, poker is never played in a vacuum and understanding the tendencies of the opponent will certainly increase your edge. If everyone posted screen-captured video of their table, I'm sure the advice would get a lot more interesting and the differences in style between various posters would become even more transparent.