While I understand where you are coming from, I think some of those are subjective.

I personally prefer articles that link to other(better) sources for definining concepts instead of trying to explain everything.

So several times I read articles like a stack, starging with A, then in the middle going to B and after finishing B going back to A. It doesn't bother me at all. It actually says to me that the author understands they cannot be experts on everything and recognize other articles.

I also enjoy articles with reveal their twist late if they are not super long.

On my personal blog I am actually writing both styles (just explain right away, or build up to something that will become clear later in the article)