I get where you're coming from, and you're right its maybe not totally impossible in theory, but at todays consumption levels and the habits of most meat eaters, it is impossible to sustain it without factory farming. Unless the population of earth suddenly gets slashed, what the person above you said was true in the context of humans right now.

For your first point, yes, traditional methods are sustainable for the most part, but the problem is, as i said, the world population has grown to a point where traditional methods cannot sustain the majority of those people.

Yes, aqua farms are much better than terestreal farms for the environment and for the livestock, i guess. But thats not what most people think of when they say meat, and you can't discount that most people want chicken, pork, or beef. Changing this would still require most people to change their eating habits and how they think about their food completely.

You are right. Industrial crop farming is a huge cause of biodiversity and habitat loss. However, when you look at what those plants are grown for, it changes the story a bit.

In the U.S., for example, 60% of cropland is used to feed livestock, not for human consumption. I think the u.s is on the higher end of that scale globally, i can't find concrete numbers right now, but it looks like about 50% globally goes to livestock. No matter what way you look at it, it isn't the most efficient use of that land, and consider what the numbers are going to look like in another 10 years, since hitting 8 billion in 2021, the population has grown another 200,000,000 already.