The last 10% of software reliability can cost as much as the rest of the build

MoonL88537 · x · 2026-07-23

The post argues that getting software to 85%–90% is usually enough to ship something useful, but the final 10% of reliability can cost as much as the rest of the product effort combined.

The conclusion is blunt: for many products, truly reliable software is economically irrational unless the stakes are high enough to justify the extra work. The quoted thread frames this as a broader critique of how vulnerable modern software is to exploits.

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