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Taking it a little further:

Let's say that Apple modifies the construction so it becomes, oh, 50m/5 bar water resistant.

Now put yourself in Apple's shoes -- specifically, in charge of writing ad copy for the Watch.

You know that it's now essentially waterproof (and it's even surf-proof). You know it won't have any problems at the sauna or while snorkeling.

But you also know that the touchscreen still doesn't work right when it's wet.

What do you write?

Apple watch will now track your activities while swimming, or diving to the depth of xx meters!*
(very small print -- *touch screen functions may not work underwater)
 
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