Also, you know, specs can and have bugs. You can have the most comprehensive requirements and specification and a 100% correct implementation of the spec and st

Also, you know, specs can and have bugs. You can have the most comprehensive requirements and specification and a 100% correct implementation of the spec and still end up with software that just doesn’t work, because the spec and the requirements had incorrect assumptions, or worse, had internal contradictions baked into them. Happens all the time. Best to just accept it as inevitable and design the process so that it can cope with it.