The main point is always worth reiterating (take care of your body), but before a bunch of people run out and buy wrist supports I just want to add that things like this are not universally endorsed by physical therapists (or fellow injury-prone hackers). They can lead to secondary issues like atrophy and poor circulation, which in turn lead to more issues, etc.

Having been through multiple versions of these (the kind he has, less restrictive ones, custom-molded ones), I found my body held up best when I kept it active and strong on its own. The term "crutch" has a double meaning in the English language for a reason: sometimes it's truly necessary, but when it's not truly necessary it's actually hurting you in the long run.