All I see about plant based diets say the same shit without answering the though questions. They always say, "it's possible to be a health vegan if you watch your nutrition". Well that says precisely nothing. It is a carefully crafted message to not upset militant vegans.
The impression I get from that message is that it is far easier to be healthy if you don't avoid meat. You don't have to watch your nutrition much. You just have to use common sense.