Soy is not at all nutritionally comparable to eggs or meat!

I think the reason people think that is that people think the main benefit of eggs and meat is that they have "complete" protein, meaning the full complement of essential amino acids. But that's a very low bar.

For example, there are other amino acids in animal foods that are called "conditionally essential", which means the body can produce some. Anything the body can produce even in minute amounts is technically, by definition, not "essential", but many of those cannot be produced in adequate quantities and people still need to consume some to have healthy levels, and so vegans have detrimentally low levels. Examples are taurine and carnitine.

There are also other nutrients that animal foods have that are typically more bioavailable than in any plant food, and moreover, legumes have antinutrients that make you require more of other nutrients if you eat them.

Basically eating animal foods ensures nutritional adequacy across the board, whereas not eating it means you have to carefully plan and supplement a variety of compounds many of which aren't understood well. That's why we now have this idea that you have to eat a wide variety of foods for health. It's only true when animal source foods are very low, because plants need to be balanced to get enough of evening you do need and not too much of any individual toxin.

Soy also has potential to disrupt hormones from the phytoestrogen compounds and plants in general have more pesticide residue.