In fact nothing matters until the moment is Now. Depth perception lets us sense when something is approaching. Whether it's a car on the highway or a beast in the bush, we need to know when things are getting closer, and we need to know how fast they're approaching. Survival depends on it. But not everyone has that sense.
Some people live their lives constantly running up against deadlines.
Year after year they end up wondering what stores are open late Christmas Eve. Or they wait until the last minute and pull marathon project all-nighters, over and over and over again. Or they're chronically late for supper even when they WANT to be there on time. Because they simply don't notice the time going by. But depth perception isn't the only way to survive.