Why is that silly? That's literally what you'd have to do in reality. Shoot a fireball or an arrow every once in a while to keep your form. Is that too hard?
No, it wouldn't be hard, just tedious and immersion breaking. Further, you -don't- lose major, well developed skills in the time spans that you're talking about (weeks). I could go without talking for a month and resume speaking just fine at the end of that month. It would take a year or longer for any significant changes to occur.. and that's just too minor and tedious to bother programming in. Remember, they don't have unlimited resources, and priority goes to putting man hours into things that actually matter.