It's not a huge difference really. You can find meaning in a hobby, sure. But it's harder and more interesting to find meaning in little things. Like breathing. Have you ever stopped and considered how fucking crazy it is that we breathe? Or eating. If all you had left in the world were ten grains of rice, imagine how much more incredible that rice would seem, or how much more you would taste and feel it. Hobbies are fine, but they aren't the core value of the video game of your life; they're just expansion packs.