I don't think it's so much that you're majoring in the minors (though that's definitely a big part of it). You're missing the forest for the trees. You can't just look at one set/rep scheme that's recommended for one particular exercise without taking the program, its goal, the load, and total training volume into consideration.
Some of those articles you linked might seem vague or confusing because they're intentionally only addressing one topic, but some of them do explain why they're suggesting whatever they suggest. And some do clarify their recommendations but you missed it.
literally says "The second rule is that the lower the reps per set, the more sets you do."
Both of these articles very clearly emphasize the role that load (weight) plays in the set/rep scheme, and explain how that influences the end result.
Also says "Try starting with 4-6 exercises per training session to address areas that need the most work." Which means you need to look at total training volume, not just the volume for whatever individual exercise you're doing.
Not every article is going to take the time discussing the details of overall program design, because at a certain point, you need to expect readers to have a basic grasp of certain fundamentals. And not for nothing, but if you've been lifting for a few years (looks like you're a member for about 4), you should at least sort of understand how training volume works.