This technology if it could be mastered, would have huge implications. Raising livestock has considerable financial and environmental costs....think of all the grain they have to eat, all the pig and cow excrement, etc.
But there is another angle to this. The exact same technology that would allow us to replicate meat would also allow us to grow human flesh. We can already do this for skin but think about being able to take a person’s own cells and grow say, replacement organs that are perfectly genetically matched since its their own cells. The medical implications would be staggering.
Your first point is very valid, as anyone who has ever lived near a confined feeding operations can tell you which way the wind is blowing by the eye watering stench. During my first master’s degree I worked with a large agribusiness group to use drones with airborne lidar to measure from the air the depth of fecal material in open feedlot pits. We would fly over and take millions of data points then come back a few weeks later and fly the same plot the difference in elevation was the depth of manure. we then calculated how many METRIC TONS of manure would need to be backhoed out and how many dozens of 18 wheel trucks. The depth of manue was measure in feet it compacts to a solid mass in the sun and heat only heavy equipment can excavate it. all that biowaste has to go somewhere usually sanitary landfill as it is not in the right conditions for digestion via fermentator.