Classical Economics (capitalism) is not an economic system but an accurate description of how people deal with each other.
Replacing it with any other system rapidly cuts people out of the equation and you end up with no input (people) and no output (people).
And that is why Socialism doesn’t work. It is irrelevant and blind to the people and their needs.
I prefer “free enterprise”. “Capitalism” is a pejorative term used by communists.