"Slight" water damage is sort of like being slightly pregnant. It is a binary thing. While you had it out in this barely sprinkle obviously water did get inside the iPhone and your display unit failed since water and electricity don't play well together. And it isn't covered by the warranty unless you purchased AppleCare+ which you didn't.
So as you are buying your new phones and tablets, etc. be sure to read the complete warranty on them to see if there is a warranty for water damage. If not when you are out in a barely sprinkling situation you will be in the same spot. And lots of phones drop calls which usually has more to do with location and the cell service provider rather than the phone. Be sure to check support forum site for whatever phone you are considering buying to see if they are problem free prior to purchase.
This is a user-to-user technical support site operated by Apple, no Apple management is here to read your comments. I'm not sure what you expected Apple Support to do with your water damaged phone that would be helpful other than an out of warranty replacement. As for me I really don't care what type of electronic devices you purchase and use, buy whatever meets your needs. But there is no nirvana out there.