But they haven't done that so your comment doesn't make much sense.
I have yet to see a text message of great enough importance that couldn't wait to be replied to until after stepping out of the shower. I don't know maybe you're text messages involve life or death decisions or impact millions of dollars and need to be responded to immediately, but I think that reasoning is a bit of a reach. (That's not to say I don't jump in the shower wearing my watch, but that's so I can rinse it off after working out to remove the salt from sweat, not for any need for functionality when in the shower)