3 ideas
The republic is shown defending itself and surviving, so the novel tests its socialist society under pressure rather than showing it only at peace. Published in 1930, it is a rare hopeful socialist utopia written as the Weimar Republic was sliding toward collapse.
A just society is not a finished state that sustains itself. It is an achievement that the people it displaced will try to reverse. A utopia that shows only harmony is naive. A persuasive one shows the institutions and resolve needed to beat organised reaction.
In a moment dominated by fear of collapse, writing a positive picture of the future is itself a political act. It keeps a concrete alternative in view when the surrounding culture has stopped imagining one. The hopeful utopia serves as a working blueprint and morale device against political despair, not as escapism.