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So is the chosen stat save wasted if you already are proficient in it?
Why would you take the feat if you are already proficient in the save?
Normally stacking two bonuses is allowed, but the proficiency bonus rules explicitly disallow it.
Why would you take the feat if you are already proficient in the save?
This. The Resilient feat exists to allow characters to gain proficiency in a save they would otherwise lack. If you're already proficient, don't take that feat.
Well i was thinking a situation in which lets say a fighter has uneven stat in constitution and wants to take it to be even through this feat.
Said fighter takes the ability mod instead of a feat?
If you have already grabbed the Durable feat (which also gives a +1 to Con and a good bonus to hit points recovered from hit dice) then just go for the +1/+1 ability score increase even if the other ability score is already even and raise that one later. I like even-ing out my ability scores myself, but if I end up at level 19 with an odd score in a dump stat, it is not the worst thing in the world.
It seems slightly restrictive such as if a fighter with an even number dexterity picks a dex save, but never intends to raise the now odd numbered dexterity score, basicly wasting a statpoint.
Although it does possibly open the door to silliness like "CUNNING LINGUIST" gain +1 to Wisdom and gain three languages and learn secret codes, "CELEBRITY ATHLETE - Add +1 to Charisma and gain these bonuses to athletic maneuvers. Still, it doesn't break anything so I would probably allow it if the player wanted to role play those aspects of that character.
