CICD and iterative development and agile work because interactive building leads to better product. Otherwise we'd all build perfect software using waterfall me

CICD and iterative development and agile work because interactive building leads to better product. Otherwise we'd all build perfect software using waterfall methodologies and release only once a year. If implementation is cheap then you implement, review and then re-implement. Not even iterate in the extreme case. Throw it away if needed and start from scratch if needed.