> While difference between 1.2.3 and 1.4.5 is instantly apparent to any human?

The author's point is that the difference between 1.2.3 and 1.4.5 can be anything from a bugfix to the software going from self-hosted photo software to now it's driving a car. The assumption that users have the same perception of a major and minor version as the developer responsible for the versioning, is assuming that all humans understand versioning 100% identically.