Luckily I don't like bottoming out very often.
A good policy... but that's just the start of long list of possible ways you can damage the incredibly complex tangle of nerves, tendons, and blood vessels that make up your hands.
Now, for actions such as trills trying to use your body becomes very difficult (again still possible but to less of an effect) so you need to build up finger strength, more or less the same muscles needed to type on a keyboard.
I don't know much about playing a piano, but what you're describing sounds similar to typing, but it still wouldn't be quite the same thing, especially if you apply this to gaming where you might go 2 to 3 hours without more than a momentary break followed up by probably another few hours typing.
It's probably actually better if your choice of hand exercises are NOT ALIKE because you don't want to be overstressing the same soft tissues over and over again. Overuse syndromes is related both to what is getting overused and how it is getting overused.
You've probably heard of high performance athletes going out to do a different kind of exercise on "recovery" days. A runner may go for a swim in the pool or spin on a stationary bike. The general idea behind this is that cross-training may help them make tiny gains while they're recovering from their normal mode of exercise. This allows them to take a day off without taking a day off.
I'd rather be able to keep typing and playing piano for a long time yet, so I'll be paying close attention to them.
There aren't a lot of 21 year olds with serious RSI in their hands, but there are a lot of 21 year olds who are headed down that path without knowing it. It'd be impossible to say what your choice in switch or hand exercises could play in your ability to keep your hands healthy so don't go and switch to a Cherry Brown board just because all of this sounds scary.
The opposite of the usual conventional wisdom could actually be true too in that a person gaming with a BS keyboard could start to lose dexterity sooner due to fatigue, become frustrated, and take a break from gaming whereas the same person with light switches, might have been tempted to go kick ass for another 4 hours. Regardless of the type of switch, the sheer number of hours and keystrokes you log per day is just as indicative if not more indicative of your risk of injury.