I might be weird, but I love phases 2 to 5 and I hate phase 1 with a passion. I hate speaking with people to see what their problems are. I want to solve problems, not user surveys. And all the itches I have are either already solved, not itchy enough or too wide / ambitious to approach them solo. If LLMs solved exclusively 1 and told me "this problem is actually valuable, go and solve it", I would be the happiest person in the world. It's not true that ideas are cheap. Or better: ideas themselves are dirty cheap, good ideas are invaluable.
Even if you're entreprenurial, LLMs are useless for this.
You can't go really hard unless you can come up with something people weren't expecting, but when they discover it they want it. You can't just sit around waiting for people to want things properly. That's extremely passive.
The point being, the idea of using LLMs to find what people already passively want is itself flawed, even if you like marketing and selling to people. It's a really fundamental problem with the idea.