I phrased it incorrectly, you are spot on "much less bio-available when compared with animal products"
We feed plant products to our animal products. If the plants are not nutritious, animal products become more expensive. I don't think animal products will prevent wealthier people from being priced out of their necessary nutrition.
It's better to think of the long-term cycle. Ruminants in regenerative management, for instance, increase the richness of the soil over time. Whereas it's very hard to do that with crops.