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The major downside of vibe coding is that you end up with 1) much more code, and 2) badly factored code, which leads to 3) very poor token efficiency when making changes. It probably still all works, but the cost of maintenance and change grows much faster than for manually written/reviewed code.

More code incidently also means 4) higher cost to audit, 5) more bugs and 6) poorer cpu and memory performance. Still, lots of hand-written software is slop and people still pay for it.