For example:
I buy a stove. It will only run on American outlets, and it can cook four pizzas at once.
I decide to take a trip to Europe. I'll obviously need to cook pizzas while I'm there. My old stove cooks them really well (I love my existing characters), but it won't do anything if I bring it as is. So...
I buy a second stove. It only complies to European outlets. It can also cook four pizzas simultaneously. Now I can cook pizzas anywhere. The new oven can cook pizzas pretty well too. Technically, I can also cook eight pizzas simultaneously, too, but I'd have to fly back and forth a lot and the pizzas would burn while I was doing that...
But what if I go for the other option, and upgrade my first stove? Now it can cook pizzas anywhere, anytime. It cooks pizzas really, really well. I can now have four delicious pizzas anywhere I want. But wait! Those crafty engineers have somehow managed to give me more room in my oven. I can make six pizzas now! Huzzah!
Now, obviously analogy has its own problems. But I think I did a good job.
