Sorry, but ergonomists disagree. Moving your whole hand + arm, as long as you are not twisting your wrist, is in general recommended.
I've asked them about keeping the fingers on the home row, and the response has always been: "No good research to support it, nor any to disrecommend it."
While most people do not have an ergonomic keyboard then what you say is likely true and most ergonomists would agree but I think they would also agree that even better is not have to move and use an ergonomic keyboard. That comes with cost and time which is why most still dont use them.That's actually kind of nice to hear - I'm self-taught when it comes to typing (having to get chat messages out fast in StarCraft online multiplayer waaaay back), and naturally fell into a style that kind-of hovers my hands on the edges of the keyboard, using my shoulders and elbows to push my hands inwards when the center keys are needed. Relevant to the topic: Pinky on ctrl requires no twisting, just bending the finger down.
Whenever people (mostly co-workers) realize how I type, they almost always think it's kinda crazy, since I can hit keys without feeling from the home row..