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Comparing the weight of animal feed and consumable meat isn’t very useful because almost 100% of animal feed isn’t edible by humans. It’s not like that 5kg of feed is going to be eaten by people instead of going the animals.

There are lots of inefficiencies that are perfectly normal. Compare the amount of sunlight needed to produce a single gram of plants. Why does that ratio matter?

It’s not valuable to compare even beans to steak as they are completely different nutrients. 100g of steak has 271 calories with 19g fat and 25g protein [0]. 100g of cooked black beans has 132 calories with 24g carb, 9g protein, and 1g fat [1].

You don’t compare these foods by weight if you’re talking about human diet.

Animals consuming massive amounts of stuff people can’t eat is a feature, not a bug. That’s the point of cows, that they graze on grass and build up nutrients for people to eat.

Now the issue of factory farming having cows in a pen being force fed is a separate problem. But meat itself is useful for feeding people.

[0] steak nutrition https://g.co/kgs/wFer2d [1] https://www.yazio.com/en/foods/black-beans-cooked.html