Model-Market Fit has some bangers:

When MMF exists, human-in-the-loop is a feature. It maintains quality, builds trust, handles edge cases. The AI does the work; the human provides oversight. When MMF doesn’t exist, human-in-the-loop is a crutch. It hides the fact that the AI can’t perform the core task. …The test is simple: if all human correction were removed from this workflow, would customers still pay? If the answer is no, there’s no MMF. There’s only a demo.

and

The gap between 80% and 99% accuracy is often infinite in practice.