You are taking this way too far as an argument. Russia at the time was miles and miles behind any Western nation in terms of development. They knew it, which is why they thought their revolution would fail unless Western nations, German workers in particular, would start their own revolution.

So they already started with a huge handicap - on top of that WWI and the civil war after the revolution, which was a fight tooth and nail, as bad as it gets, put them down even further.

So even if the "experiment" would have stopped right then and there and they would have switched to pure capitalism, what kind of development would you have expected?

This is not to take anything away from your mention of their propaganda efforts to appear a lot bigger than they are, but your argument leaves out some important "details".