Frozen meat is perfectly fine, I use it all the time. And even if it wasn't, should we really sacrifice the environment for the sake of our tastebuds?
But the way humans raised animals prior to the last century seems a lot less problematic. If we reverted to a more sustainable, regenerative practice of farming, that would surely reduce animal suffering and not damage the environment to anywhere near the same degree. It would also create a lot of jobs. But if you're trying to feed 8 bln people then you will need to figure out ways to reduce waste in the supply chain. Like freezing meat.