It's never true. It's like a broken clock - it's right 2 times a day. When the conditions are exactly correct, it seems like the labor theory of value is true - but it's not. Consider a simple example - food production. Nothing changes about the labor necessary to produce it but that doesn't mean you won't have to sell your produce way under price (or let it rot) if you and other farmers make too much of it.

True, in a commune or something like that, it does work. I think though once we hit Dunbar's number, then it breaks down and we need a subjective value based market.

Industrialization via the profit motive has been the single greatest lever of increasing humanity's quality of life.

The people who say that the rest live in shit in my experience have never been to a third world country and actually lived there. If they did, they'd realize just how shit the first world is.

As long as we have scarcity of goods that must be distributed somehow, communism only works in theory, not in practice.

Edit: Ah, I see, so you're a tankie who grew up in the USSR yet still supports them. Thanks, I have no need to speak to you further.