There is so much to do it's tempting to try to do multiple things at once. Listening to music while reading or doing chores, reading the news while watching movies or shows and so on.
Why can't we focus on one thing at the time anymore? Why it feels we don't have time for everything and therefore need to do more than one thing at the time.
And while we do those things, we don't concentrate on any of them. They just slip through and afterwards we have this false sense of accomplishment without a memory of what we just went through.