I've been doing that for many years, see above, but - to each their own.It's fine, but I would never shower with the watch on my wrist. First of all, it's a perfect time to charge the watch. Second, Apple says that soaps and detergents/shampoos can damage the water resistance seals on the watch.
About Apple Watch water-resistance – Apple Support (AU)
Find out more about the water-resistance of your Apple Watch and what to do if your device gets wet.support.apple.com