That is primarily because coding is so fast we lose track of things .. besides ... vibe coding means we never follow the time tested methodologies like Scrum or ASAP ..
The key is to use LLM not just for writing code .. use it for
0) General specs and milestone plan
1) Tech Specs and sprints planning to hit the milestones
2) Test Plans .. automated to be done by LLM , manual testing to close a milestone.
3) Bug Tracking .. any bug that gets you back into regression of closed milestones must be recorded as Primary defect .
4) Knowledge Management - Have LLM note down all the cool ideas and insights that we get during build .. this is important for how and why you made design choices
5) Configuration Management .. complete deployment plan ..from dev , test to prod
6) Change management .. .. you will always make changes to original plan .. have LLM record all the changes that impact closed milestone
7) Metrics - goal should be to reduce primary defect density by 70 percent from build to test to user testing ..
Have LLMs update these documents besides writing detailed notes for every git commit ..