Most beyond products I know don't even contain soy as protein source.

Regardless of what you think about phytooestrogens (which has very little evidence to have negative effects in normal quantities)

You're right, they contain yellow peas. But ... these are also rich in phytoestrogens.

(It is also an Asian crop, originally, maybe that has something to do with Western people, especially men, not being very well tolerant to it)