He explains these because they are a source of controversy to the Corinthian church. These are reflected in three simple truths about choices. Paul chose to forego the open door in favor of finding Titus. Such is reflection of his identity. Paul understood that in the matter of choices, one seldom has it all figured out.
Servants simply respond, aroma simply spreads, change takes time.
Paul chose to suffer, even poverty, if necessary to be the emissary of God. God is supreme for the servant, and the purpose of God for others and in our own lives is essential if we are to make right choices. I wondered if our introduction to the Bible should perhaps be introduction to Christianity, maybe Christianity 101. What, if anything, could I do to help make better choices. But Paul does write, choose what is best.