I spent the last couple years working at a company in a highly-regulated space. I agree with the comment you replied to, and "selective enforcement" is not how I'd describe it.
Think of, say, a teacher. Suppose a teacher gives a complex assignment, provides contact information and says students can and should ask questions, submit drafts for feedback, etc. And there are two students who take different approaches. Student A simply glances over the assignment sheet, goes off and does what they want, then hands it in on the last day. Student B asks questions early and often to clarify anything they're not sure about, runs a draft or two past the teacher, and makes changes in response to feedback.
Student B is much more likely to get a good grade on the assignment. Student A is much more likely to get a low grade out of the blue for making serious mistakes.
And this isn't selective grading, it's just a reflection of the effort each student put into getting the assignment right. Both students had equal opportunity to put in that effort, but only Student B actually did, and it shouldn't be seen as a problem if Student B's diligence pays off.