If nothing we do ultimately matters, why should we even read this stuff?

Strictly speaking, you're right. Truth is Truth regardless of what you read and when you read it.

However, your experience and your rate of progress are impacted by the choices made in your mind.

Reading, on the level of perception, is one way of gaining new insights, communicating with others, sharing ideas, and persuading people.  On the level of mind, reading is totally unnecessary.  Mind exists outside time and space, is perfectly One, and is perfectly Knowing. God does not have to educate Creation; creation has no lack, no deficiency, no limitation, no ignorance. Creation is perfect, just as is God.

Nothing in our dream life is causative. All here is symbolic. Your choice in reading material can symbolize the decision to join or the decision to separate. As our minds choose more and more to accept the Oneness of Truth, our decisions and actions begin to reflect that choice.

I am not proclaiming to anyone that you 'should' read this blog, or the Course, or the Bible, or the Koran, or Time magazine. I am claiming, however, that considering the idea of non-duality will help your mind to open and will expedite your progress and your experience of peace. It will save you time and help you cut through distractions. Why? Because non-duality is a more accurate way of describing Truth. The more accurate the description, the more likely our mind is to choose to experience It. And the more we experience reflections of Truth, the more we will make that choice in the future.

Non-dualistic thought speeds up spiritual progress. If doing things more efficiently and in a more optimal fashion appeals to you, then I suggest you consider these ideas. If not, that's okay, too. Time is illusion. When we awaken to Oneness, it won't matter at all if you dreamed of ten minutes or ten lifetimes; all that  will matter is that you will recognize that the dream is over.