Very few things can clear this hurdle, and even less so the sorts of things that tend to come up on HN. Very, very few industrial farming topics come up on here for example.

Perhaps a more apt framework would be, "What's the reason someone is giving you money for this product?"

Why don’t people use the word “value” then? Why “value proposition” and not just “value”?

I assume it's because "value prop" is VC lingo which is a prompt to founders to give their customer "elevator pitch", and we're on community forum that's motivated by VC perspectives & lexicon, so those get broadly appropriated by many participants.

"value proposition" is about how you demonstrate the value.