Microchipping - what's the use and why can't we microchip our humans?

Dear George,
I'm Ricardo and Bubbles is my twin brother! Look at the photo attached! Bet you can't tell us apart! No one can; not even our humans!
And what's most exciting about us is that we do everything together -like really good brothers often do-  we cuddle together, we hug while sleeping, we eat together. We are inseparable. I know it's rare in the feline's world but that's what we do.
George, I'm writing to you because I have a question and nobody else to ask! I heard my humans talking about micro chipping us!
I don't understand why? We are indoor cats; what is the chance to "go missing"? None!
Then, why am I supposed to suffer an "open skin" surgery? Who will benefit from it? The vet? putting more money in his pocket?
My humans? Finally getting a easy way to tell us apart? Who? Cause I don't see any benefit to me or Bubbles.
Oh! Yes! I've heard about that "run away" cat from California who ended-up in a shelter in Canada!
But, let's be serious! Do we look like the type to gang-up with truck drivers and have an escapade?
I don't think so! Then.....why?
Yours .....quite confused
Ricardo

Dear Ricardo,
There are many ways a cat might get lost . You might jump or fall out of an open window: the cat carrier might break open as you are being taken into the vet surgery: you might just sneak out into the road as your humans open the door to leave for work: you could be cat-napped by a burglar: or just let roam by a negligent cat sitter or even a negligent cattery owner. I have heard of all these accidents. Without microchipping, your human pets might never be re-united with you. 
I have been thinking of how I could microchip my humans. It would be useful for when they desert me for a"holiday." They could be found and returned to me early.
Yours 
George,
Interesting that you look so alike. Most litters of kittens have more than one father, so often kittens don't look at all alike. We cats are sensible. We don't do jealous. We queue up for a chance to mate without any inter-male violence! So unlike humans.