I'll concede "most people are of average idiocy" and cite core principles of statistics and the meanings of average and most.

But yes, you're right, happens all the time. Less so with most of the large scale more popular redesigns people tend to think of when writing articles like this about tools they actually use; the team at Atlassian, for example, is not made of idiots, neither at Slack, Google, Twitter, or other large companies with mostly significant design experience.

Smaller operations where we all likely work—yep, hit or miss.