There are a lot of things in our modern societies that would seem impossible or magical to someone from just a few hundred years ago. Why assume this is the best we can do, when so much progress was accomplished already?
Because you’re centralizing power. The more you centralize power, the more you increase the spread and power of corruption. This is why it always fails including with the system we have now. The difference is that in socialism, power is centralized from the start which is why it fails faster and why it takes longer for capitalist systems to fail compared to their socialist counterparts.
