Except for most conceptions of socialism/communism (talk of proto-communist hunter gatherer societies notwithstanding).
(Non-strawman) communists see communism as a future post-scarcity society, like Star Trek economics. To them, the path to get there must involve ownership models that (to them) are not exploitative.
From the very start the idea was to figure out how to arrange society in order that the incentives are maximized to bring about post-scarcity. (Let's not get into a discussion about how well anyone did in attempting to bring that about - that's a very complex topic by itself).
So I don't know what you're talking about when you say that socialists are looking to back to some golden past.
I read a lot of broad ideological writing as well, so when people make statements that go completely against what adherents of a particular ideology have been saying themselves for over 150 years, well, it's a little jarring.
Again, this isn't about any ideology being right or wrong, this is about accuraccy.
> There are no better ideas.
The biggest mistake you can make is thinking that history is over.