I repeatedly saw "There are no hidden rules" or "There are no secret rules" being given as a governing principle for interpreting rules in 5e, but was unable to find a question that documents the source for these statements in search -- until recently.
I found that this answer to the question "What is the source of the "spells do only what they say they do" rules interpretation principle?" is giving a perfect answer to this, an answer that is actually broader than just being about spells.
This question is not a duplicate, it is asking about a specific formulation, not just a generalization of the guideline for spells. See also this earlier closure discussion, which concluded this is not a duplicate.