It’s not even a good solution. Take, for example, Earth. Half the people are gone. We’re at about 8 billion people now. Know when we were at half that? 1973. This solution puts the clock back by 50 years, causes a lot of pain and strife, and Thanos (and most people on earth) would likely have lived long enough to see the correction he made undone. When a solution that drastic doesn’t solve the problem for even a lifetime, it doesn’t even approach being a good one.
It’s not even a good solution. Take, for example, Earth. Half the people are gone. We’re at about 8 billion people now. Know when we were at half that? 1973. This solution puts the clock back by 50 years, causes a lot of pain and strife, and Thanos (and most people on earth) would likely have lived long enough to see the correction he made undone. When a solution that drastic doesn’t solve the problem for even a lifetime, it doesn’t even approach being a good one.