The part that I said wasn't entirely worthless was about those problem statements that are very specific and niche (I was contrasting that to the worthless ones).
Basic example, "People want more tasty Pizza", "People want better wine" is trivial and worthless.
A much more narrow, specific, and niche example could be valuable. Something like:
"In $area there are lots of migrants living from $country and they love this $local_type_of_bread that you can't find here at all. If you can bake some fresh ones you can probably make good money with it. You could sell them via these local ethnic grocery stores that people there visit often."
Unlike the first example there's some specific and non-trivial information there.
haha not sure if you are trying to be funny or you just dont get it.
Build something better is a figure of speech looks like you have taken that literally. If you search for the freshdesk story you will understand there were specific pain points discussed.
FB and Google were not multi-billion unicorns when they started.
In your previous comment you said it was not entirely worthless but now you are saying such comments are worthless. Atleast make up your mind.