What's to stop the PR process pushing something that is "a mess" ? We're not all knowing and make mistakes.
The beauty of software is that it can be changed, so if someone pushes up a "mess" then it can be fixed.
In practice, if you trust your team... then people wont be pushing "messes". Sub-optimal? Sure, but its not a big deal.
The problem with this kind of ceremony is its trying to optimise for perfection, which no one is capable of. What you should be optimising for is fast feedback loops so you can quickly iterate to something that resembles useful software.
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