It's not easy. That's why it's important to be straightforward and just move on without all the navel gazing.
> ... hoping you hit the lottery with product-market fit.
There's this thing called "research" where you talk to real people, instead of guessing.
> That doesn't retroactively make their effort worthless
No-one said building the wrong thing was worthless. Life is one continuous mistake.
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we are saying mostly the same thing i'm pretty sure, especially in your other comment reply (https://news.ycombinator.com/item?id=48498912). although i feel you're dressing it up a little too much for my liking. i prefer being a lot more plain and direct about it (and probably a bit arsey).
ruthlessness is an asset when it comes to we built the wrong thing. ruthlessness gets us moving on faster.