That assumes that you know that you can do a good job of prioritising, though; there is a third option, which is genuinely not knowing whether something is important or a waste of time.

My T does not want me to spend my energy on prioritising, because for me, that becomes self-censorship. And almost anything can be important in therapy, too. It's one of the ways in which therapy is different from real life. Most of my thoughts and feelings are irrelevant when I am with other people, and I learnt at a very early age that being quiet was the way to be safe. The latter is not true in the same way now that I'm an adult, but it is always a safer option to be quiet when in doubt. But in therapy, those irrelevant thoughts and forbidden feelings are suddenly not unimportant, for 45 minutes, and then they become unimportant again. Small wonder I'm confused about it all.