r comments. I agree with everything you say, of
course.

Regarding terminology, the terms "regular" and "irregular" are somewhat
neutral and descriptive, while "natural" and "technical" may be confusing
since, as you point out, scientists try to develop technical definitions /
descriptions for natural concepts like "space", "time", etc. However, I
would not object to using the terms "natural" and "technical" in this way.

Another terminology that is used in the literature is, of course,
"classical" vs. "fam