AppleCare specifically covers water damage of any kind, and is what I would assume OP would be referring to as a "premium warranty and repair service".
ApplecCare is as much a warranty as their Apple's phone are guaranteed waterproof.
It's marketing.
The 3 year warranty add-ons is an insurance. One can get an insurance for any device.
And if you truly are ultra budget $300 phone guy then sure this doesn't apply to you.