It's nice that Samsung repair phones, I also don't know how long for, but you can't rely that they always will, and not all phone manufacturers are Samsung. You shouldn't have to rely on the whims of the manufacturer.

This is why phones should be modular so the parts that wear/break first are replaceable, and also why those parts should be available to you and third parties, not gatekept by the manufacturer. Repair companies can then stockpile parts themselves, instead of having to scavenge from dead phones, to repair your existing phone even when the manufacturer refuses.