Move does not miss unless your opponent is underwater and you are above, makes sense. And this happens in anime a lot (Ash: Hide underwater!!)
Okay, maybe not half, 75%. Amended. Still, you have special moves. Any team or roosters without special attackers should suffer a bit, not that they can get to this point of Reborn anyway
As for the freezing, maybe only freezes for half the duration? Water helps to thaw too. You could very well be defrosted right after frozen with this implemented
Oh, and DOT is only 1/16. Leftover solves this. Not that you're gonna use fire/rock pokemon underwater a