That is how the story goes, yes, also difficult to get some of the vitamins(B), as getting them from the soil is rarely option now, yet animal meat would have it(although again from that same soil).
There is soo much that can be said... About the eyes, about intestines, about chemical processes that work in the body itself and how the stuff that we use is made by the body...
I remember some years ago defending the opposite position in places where I wish still existed, so I could correct the stuff I thought was thoroughly researched back then. There is much that could be said... But seems pointless to go into it now...
Anyway, we shouldn't go into it, its one of those topics, like politics and some other stuff, that people hold very strongly to their point of view based on what they know at the time. I know as I was supporting meat years ago, much less supporting it last 7-8 years and staying as far away from it as I can now. And I think my desire for arguing about it got less and less with time, even though what I know increased(as unevitable happens as life progresses).