>> common situations as: sitting in the bathtub
What? ...what?!
Please tell me you're kidding. I would never, nor do I know anyone who would ever - be so shockingly daft as to use a phone or tablet in the bathtub. Come on. Even if it was 'waterproof', I still would be too paranoid to see it as a shocking hazard...we learn as kids not to put electronics in the bath; at least everyone I know did...
On the toilet, all the time. In the bathtub?! Let's give human beings some credit. We're not daft.
Waterproofing is ideally for the time you accidentally drop your phone into the toilet, and that alone. Just because it's gotten really great doesn't mean people's attitudes on this has suddenly changed.
Electronics and water don't mix. I can't imagine sitting in the bathtub with an iPhone, iPad or laptop. Nor could I imagine anyone I know doing so. o.o