why do you feel that it's important to argue for "99%" veganism

This argument relies on false assumptions about my ethics and an incorrect representation of my position. First: I don't want to reduce meat consumption/production by any specific ammount; I am currently unconvinced that removing domestic animals from food production entirely is maximally efficient, but think it's clear that the current ammount of meat is unsustainable and thus must be reduced by some ammount that is currently unknown to me. Furthermore, I don't believe that all living things qualify as "people" for moral considerations. Since I do not believe all living things are people unless proven otherwise, why should I consider all animals as people unless proven otherwise? There are certain animals that I consider to be people and thus give moral consideration equal to humans such as certain species of corvid, dolphins, elephants, and octopi which have demonstrated traits that make me believe they should qualify. In order to convince me, you need to either provide me an alternative definition of a person and demonstrate why it's superior or to show me that all animals fit into my definition of person.

Edit: forgot to mention your other argument, but simply put it's also off the mark. While I agree that eating plants directly is more efficient, that doesn't address the thesis of my argument. So long as there exists circumstances such that we produce plant matter (as a waste product) that an animal can consume and humans do not in quantities sufficient to feed a stock of animals of some size including those animals in food production and feeding them the plant matter is more efficient than throwing away that plant matter. Your argument needs to be more robust.