A prime example of poor implementation that comes to mind is MCAS in Boeing 737 Max[0].

[0] https://en.wikipedia.org/wiki/Maneuvering_Characteristics_Au...

Designing infrastructure and processes to reduce human error is a very important topic.

With the recent AI boom, many engineers are working on figuring out how to build infrastructure that reduces AI errors. We rediscover many techniques (eg writing good specs) that were once used for humans, but then abandoned.