Have you ever found yourself in a situation where you're physically present, but your mind is somewhere else? If you're a human, then the answer is, most definitely, yes! Maybe you walked into another room and forgot why you went there or attended a class but have no recollection of what was discussed. As James Joyce wrote in Dubliners, "Mr. Duffy lived a short distance from his body." While funny to imagine, especially living in the information age, we can often think about our minds needing to carry around this body, which then gets a utilitarian treatment (shrink me, sculpt me, etc., a topic for another time!).
Being disconnected from our present experience can make it difficult to do many things, like manage difficult situations, build resilience, and critically think about our own perspective. A recent study done at Harvard suggests on average, we spend 47% of our time lost in thought. “A human mind is a wandering mind, and a wandering mind is an unhappy mind,” Killingsworth and Gilbert write. “The ability to think about what is not happening is a cognitive achievement that comes at an emotional cost.”
It's not to say you should be present in the moment 100% of the time.