"With so much evidence refuting the five excuses, hopefully it is clear that they are ridiculous. They are completely invalid reasons for the average developer,

"With so much evidence refuting the five excuses, hopefully it is clear that they are ridiculous. They are completely invalid reasons for the average developer, in the common case, to dismiss concerns about software performance. They should not be taken seriously in a professional software development context." I believe the average developer should care somewhat about performance, and depending on their industry they might need to care a lot, but I'm not so convinced for the average case. The average developer is not working on FAANG-sized codebases. Also, I'd imagine any large systems built up over the years that are refactored would likely see great performance gains. That's just the nature of long-term software.