WI - Soybeans became extinct or remained undiscovered

It removes some but not all. The main issue isn't that it is toxic at the level of tobacco, but that it causes minor issues that can have consequences over a long period of time. When you take into consideration the lack of all the medical safety net we've come to rely on, this can lead to serious and possibly life threatening or shortening issues after long enough. A good analogy would be the movie No Escape, when he first arrives on the Island he is lectured with what seems like a hypochondriac but he wisely points out there are no hospitals, keeping your feet clean and watching what you eat is a lot more important than it would seem.
I would guess that potential long-term health effects weren't a huge concern since a) most people died of something else before anything serious developed; b) short to moderate-term gains in food security and nutrient availability probably outweighed long-term health problems; and c) soy generally wasn't the only thing people were eating and it certainly wasn't the dairy/meat substitute people in the modern day West use it as.

Though I am not sure how much it was eaten during this time period. I've read some articles that say it was mainly used for it's oil or eaten after being fermented. The natives didn't like the gas and bloating from it's less processed varieties. If that is the case then it is a matter of the how the replacement is utilized, how beneficial it is for the soil, how easy it is to cultivate, can it be sold, does it attract any unique pests compared to Soy, ...................?
This native is quite familiar with how soy is traditionally used for food. It hasn't changed much in the last thousand years in terms of how it's processed, and no, we don't like the gas and bloating soy causes but more to the point cooked whole soybeans have been recognized as difficult to digest and not really worth eating unprocessed for a few thousand years. We have no qualms against eating boiled adzuki or mung beans though. Like I said above, adzuki beans have been grown alongside soy for almost all of Chinese, Korean, and Japanese agricultural history. Without soy, adzuki probably just fills the role that soy did with help from a few other species.
 
Without soy, adzuki probably just fills the role that soy did with help from a few other species.

Which other species together with Adzuki Beans would likely fill in role left by the Soybean?

Are there any OTL undomesticated and little known plants / crops in East and Southeast Asia which could also potentially be used in place of the Soybean in ATL?
 
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