Was about to type the same thing, am also pianist. Using small muscles to do repetitive things is exactly how you get RSI. Don't do stuff with small muscles that you can do with large ones.
Unfortunately, even in the piano community, this knowledge is not that widespread. Really common to see repetitive motion injuries from very finger heavy technique.
Unfortunately, even in the piano community, this knowledge is not that widespread. Really common to see repetitive motion injuries from very finger heavy technique.