I have never considered it personally, lots of delicate parts in there, and there are plenty of other viable locations to choose from.
Trying to think about how to present your wrist to a reader, it seems to me at least that it is not that practical/easy to do. HOWEVER it would be easy for a phone / Proxmark ( Reader you can present to wrist, Rather than trying to present you wrist to a reader )
Might be a good place for a Spark or similar
Some other ideas for you
I just saw @tangerineaxle post above and I stand corrected. Unless he has super bendy wrists
