Anomaly vs. Defect? Why don’t professionals use these terms correctly?

I have seen and read respectable professionals using the term “defect” for anything that is not correct in an engineering material. With the aim of clarifying them, these are the definitions.

Anomaly:

An anomaly is any deviation from expected, normal, or specified material behavior, properties, or characteristics, regardless of whether it is acceptable or not.

Defect:

A defect is a specific kind of anomaly that fails to meet defined acceptance criteria or specifications, and thus may compromise performance, safety, or reliability.

Relationship Between Anomaly and Defect:

All defects are anomalies, but not all anomalies are defects.

Example:

Anomaly: A small void is found in a casting during RT. This is unexpected; thus, it’s an anomaly.

Defect: If that void exceeds the size limit defined in the acceptance criteria, it becomes a defect!