Because it is in the form of pure muscle, it does not have much fat compared with pork, and it contains a lot of trace elements and some non-essential amino acids. This is not so much in other animals, and the nutritional structure is most suitable for bodybuilding.
Many people like to buy protein powder for fitness. In fact, although protein powder is good, it is not as good as natural beef.
Protein's only advantage: convenience. It can be easily taken out, and the powder is absorbed quickly. Don't chew, just drink.
The nutrition is not bad either, but it is still a little worse than beef.