I would like to suggest a reason that you have not included in your list.

Forming a relationship with Nature.

Humans in Western civilization, in the phases of late Capitalism, and increasingly the remaining rapidly urbanising areas of the world, are becoming more and more alienated from Nature. The Western philosophy as can be traced through modern history and beyond, visualises humans as separate from Nature, superiour entities who have a right to dominate and exploit as they wish, as opposed to humbly being just another thread within an intricate web. As we know, Modern day society is highly consumeristic, the typical cycle is purchase, consume and thoughtlessly dispose, then purchase more and so on and so forth. The consumer is not involved in the creation process, they may in deed be very ignorant of the how or where or who of the product origin. There is no contact with primary materials, no intricate knowledge of wood grains, growing seasons or habitat types... there's no interaction, no knowledge, no relationship.

This has knock-on effects for our environment and our health.

It has been noted that if you do not relate with Nature in some way then you do not value it. The World is going through a period of ecological crisis and it more important than ever that people value Nature and foster pro-environmental values. Yet divorcing themselves from Nature-interaction exacerbates this devaluation in a type of spiral downwards of negative feedback.

Foraging wild food is one of our most primal activities, up there along with activities like animal tracking and fire-making. It presumably satisfies deep primal drivers within our psyches and relates to our health. A burgeoning new area of research is mounting evidence to show that contact with Nature is beneficial on many levels, including physical and mental health. Struggling health services are starting to look to Nature activities as a way to reduce pressure on their services in the long-term (apparently the NHS in the UK is looking into this).

I would also suggest that it is quite important as regards our sense of cultural identity and sense of connection to place, which are further interesting topics to explore and which no doubt lead back in a wending way to health benefits concerns.

Hope you don't mind my long-winded contribution, I was kind of using it as an opportunity to unwind some of the ideas I've been developing with my PhD on the topic of wild food plants in Brazil. Just another 100,000 words...