Ideally yes, it would make sense....but we can keep coming up with situations like this infinitely and I'm not sure if it's reasonable to expect Larian to add in.
Now wait a minute, they have been touting the interaction of elemental effects almost louder than they have the Ultima 7 stuff, and getting set on fire right next to water, it was the very first thing I tried!
Is it really so unfathomable that if a battle happens along the shores and you get set on fire, instead of casting a rain spell, you run into the ocean that's already there? I don't think so. Especially since its one of the first things that happens in the game, and I don't think I even had a rain spell!
If they're dropping the Ultima 7 schedules now, at least they should get all the basic environmental stuff in, imo.

(Also, that ship landing on the beach seems to be on rails, and doesn't react to the waves and doesn't splash the water or anything... but perhaps that's for final polish?)