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Last I looked the modern research around soy has shown the estrogen concern to be a myth - along with it reducing testosterone in men. I was initially concerned about this when adding Soylent to my diet since I too had encountered these myths a decade ago and stopped eating soy.

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I wouldn't call phytoestrogens in soy a myth since they are in it. There are quite a few scholarly articles/studies on it I breezed over a few mainly looking for thyroid related problems. But the articles do mention phytoestrogens. Does the myth you mention concern estrogen or phytoestrogens?

I believe the concern here is most likely goitrogens rather than phytoestrogens. https://en.wikipedia.org/wiki/Goitrogen

Some years ago there was a product recall and class action here in Australia concerning one of the soy milk brands, with unusually high concentration of iodine.

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