If it works, don’t touch it.
https://www.reddit.com/r/ProgrammerHumor/comments/12cw6xv/if_it_works_dont_touch_it/
Software Engineering is writing code integrates by time. It’s easy to write a throw away code. Ref
Nobody dare to touch#
Bad test coverage#
Bad programming interface#
Bad deployment process#
Smoke test
Canary deoloyment