[jmathai]

I think that's a bit of an oversimplification. Scratching your own itch might not solve a need for a market big enough for a viable business. You end up "pivoting" till you figure that out.

If there's a way to find that out early then you save yourself valuable time. Time which could determine if you're able to stay alive long enough to succeed or not.

Not at all advocating spending a year on market research but don't go straight from idea to your basement to start coding. Not if you're trying to build a business out if it.