Hard work is only seen as a virtue and sloth a vice because of the context of the world we are currently stuck in. You assume a system of value which might not make sense in the future.
On the contrary, it's the natural state of all thriving organisms to do some form of constructive work. It has also been the human condition and the condition for prosperity as long as we've existed. That isn't to say that leisure and play and pleasure have no value. Not at all! But it's axiomatic that nothing has value without its opposite. And if you look at the wealthy who do not work (as opposed to the ones who do), it's clear that nothing is valued by people without the sense that they've earned it.
