Had it been Samsung, they would have publicized the Watch as being waterproof.
Apple probably noticed that the waterproofing isn't perfect and want to see how many Watches are damaged by water and how in the first year.
That's a stretch. Apple Maps is good now, but has many ways it could be better. Google Maps too, but its data is more consistent and it offers functions like transit information and discovery option which I find compulsory. Also, I'd love if Apple added the possibility to always see favorite places on the Maps like on Gmaps : that way when I'm someplace, a quick look will suffice to see if there's a place I've saved closeby.