Generally, eating raw seeds results in them passing right through the digestive tract as they cannot be broken down and absorbed by the body. This means that if we pass them out naturally (not into a sewerage system), then we actually stand a chance of producing more life once those seeds grow. This is actually biology 101 and is part of the propagation of life on this planet.
In cases where seeds and grains are taken, processed and eaten then they cannot produce more life - however, it appears that when they are processed in this way, they can become a problem for the human system - for example, the weight that is gained due to eating most breads.
I guess it is dependent on the parameters. Eating a pod of raw snow peas that aren't fully developed would be digested mostly as plant food.
There are some seeds were the outer coating is digested. The seeds will often not propagate without the coating digested away by a animal.
As a side note, one of the high protein sources in my surrounding environment is buffalo gourd seed:
The seeds contain between 25-42% fat (Berry et al. 1976). Fat in the form of vegetable oil would be a critical dietary component in a desert, where animals carry very little fat on their bodies. Buffalo gourd seeds are also high in protein (22-35%) making them comparable to some legume seeds.
https://www.texasbeyondhistory.net/ethnobot/images/cucurbitabg.html
So maybe the pivotal point is on the efficacy to process the seeds or not.
In my experience, the closer we move towards a natural way of being - which involves eating natural, whole foods - the better it is for us and our environment... So yes, the processing aspect is key.
It would be very enlightening to see the results of an experiment whereby a significant number of people came together to live in a 'no death' environment' where nothing was being denied. :)
I think the people would have to travel in the experiment, as no particular location has a very good long term sustainable 'no death' calorie production rate, when compared to human consumption.
Still, I think it is a plausible possibility.