I dont have any scientific studies but unless you gorge on soy everyday, you’ll most likely be ok. So yes, keep dipping your sushi’s into it, it’s fine.
I personally dont believe anything that’s been consumed by many of the healthiest nations of the world can be bad in moderation
Soy Sauce isn’t the issue. It’s large quantity of soy ingestion. Tofu, Soy protein powder, etc, etc.
The science is still showing that soy is bad for male sex hormones. I just saw a study yesterday where soy supplementation ( > 1.2 g per kg bw ) gave no strength gains over a 12 week period, where milk protein supplementation ( > 1.2 g per kg bw )and even just average protein consumption ( < 1.2 grams per kg bw ). It did suggest over the 12 weeks there was no muscle mass loss.
However I would still avoid large quantities of soy intake.