How is showering worse than being completely submerged for 30 mins?
IPX7 is 1m of water for 30 mins. 1m of water has 1.4psi of pressure.
Energy efficient shower heads in the US have between 45 and 80psi of water sourced to them. My guess, there's lots of streams from the nozzles exceeding the 1.4psi of the IPX7 rating.
Feel comfortable about lathering your locks with the watch that close to the shower head?
(or in my case, shaving my head)
Nope, me neither. I'll keep mine dry, thanks.