There is token research that creatine supplements are especially beneficial for vegans, and creatine isn't the only thing mostly found in animal-based foods. Given nutritional sciences has a history of being a rollercoaster ride, maybe it isn't the best idea to make wild claims which don't mirror how the world behaves at large.
Water and land usage is also A: grossly overstated (you can't grow anything except grass on most land) and B: cited as something against all meat when chickens, goats, ducks, geese and pigs use far less of both. At that point, substantiate or correct your statement to 'beef'.
>A: grossly overstated (you can't grow anything except grass on most land)
The overwhelming majority of soy grown globally is fed to livestock. That's definitely does not fall under your category of "can't grow anything except grass on most land".
"More than three-quarters (77%) of global soy is fed to livestock for meat and dairy production. Most of the rest is used for biofuels, industry or vegetable oils. Just 7% of soy is used directly for human food products"
The proportion is lower for corn, but only because a huge chunk is being used for fuel. If we exclude that, it would still be the overwhelming majority.
Well, it's roughly 80% of the soy that we grow and it's what animal feed is made from.
You could feed it to cows, in which case it gets turned into cow and fertiliser, or you can let it pile up and rot, emitting massive amounts of carbon dioxide and methane.
Water and land usage is also A: grossly overstated (you can't grow anything except grass on most land) and B: cited as something against all meat when chickens, goats, ducks, geese and pigs use far less of both. At that point, substantiate or correct your statement to 'beef'.