https://thenewstack.io/cadence-is-everything-10x-engineering-orgs-for-10x-engineers/, we looked at how a high iteration rate — or a high cadence — has been used to achieve remarkable accomplishments, even in the field of aerospace, where failure costs tend to be far, far higher and more combustible than in software. The solution is to concentrate on the other side of the equation: Maniacally prioritize removing process overheads and make sure our feedback cycles work.
Giving that assurance with the required confidence requires an exhaustive test cycle, usually including manual elements.
This process has a long lead-time without any feedback cycles, and thus without the compound improvement you get from iterating.
For them, the process overhead is five times the actual useful work, which is an exercise in futility and frustration.