QA is the first thing cut when a project runs behind schedule, because its absence is invisible right up until it isn’t.
Bugs get more expensive the later they’re found
A bug caught during development costs a few minutes to fix. The same bug caught in production — after it’s affected real users, generated support tickets, and possibly caused data problems — costs a multiple of that, plus the reputational cost of users who hit it first.
“It worked on my machine” isn’t testing
One developer checking their own feature on their own setup will miss device-specific bugs, browser inconsistencies, edge cases in the data, and the interactions between their change and everything else in the system. That’s not a criticism of the developer — it’s simply not what a single person reviewing their own work is positioned to catch.
What proper QA actually catches
- Regressions — a fix for one thing quietly breaking another
- Edge cases that don’t show up in a quick manual click-through
- Cross-browser and cross-device inconsistencies
- Performance problems that only appear under realistic load
The actual cost comparison
A proper QA pass adds time and cost before launch. Skipping it doesn’t remove that cost — it defers it, usually with interest, to after launch, when fixing it is harder, users have already been affected, and trust is what’s actually on the line.