If the DM prefers to resolve social interactions based on how well the players can talk it out instead of dice rolls based on/modified by character stats, there's very little incentive for them to invest points in charisma and social skills.

The stat is useful in theory, but in practice, its applications don't come up often.The particular game requires you to have a dump stat, either implicitly (e.g., a game where a score of 2 in a stat is 'average' and you have 3 stats but only 5 points to buy them with) or explicitly (e.g., the same game, but instead of having points to spend, you are simply told to assign one stat a value of 1, one a value of 2, and one a value of 3).Why bother teaching your Knight Lockpicking for Dummies when your Thief starts out already better at lockpicking than the Knight could ever hope to become, or when your Wizard can learn a spell that magically unlocks any lock? Therefore, it's illogical for your character to waste resources in this area. The stat actually is useful, but made redundant by teamwork from other party members who are potentially more capable with it.Final Fantasy VI's Physical Evasion or Final Fantasy VII's Armor Magic Defense are two notorious examples. The stat is glitched so it doesn't do what it's supposed to.Luck increases your chance to instantly kill weaker enemies!. The stat would be useful if it wasn't nerfed into oblivion at some point in the testing process.Why put points in stun resistance when a character with the minimum stun resistance never noticeably gets stunned anyway? The stat affects absolutely useless aspects of the game.If the only purpose of wisdom is to affect your defense, and dexterity affects your defense while also improving your accuracy, why waste points on the less efficient stat? (Even having wisdom exert a greater influence on your defense than dexterity can't always alleviate this.)

The effect of the stat is overshadowed by, or even made redundant by, the effects of a different stat.After all, how much sense does it make to pump your Orc barbarian's hairdressing skill? note It depends on the amount of dreadlocks you need for your hair. The stat is an ill-defined 'flavor' stat that doesn't help your character survive the frozen wasteland or kill the evil troll king.This is the stat that you put your lowest score in, or else don't spend any points on at all. A Dump Stat is a phenomenon that occurs in games that involve multiple attributes for your characters and allow you to customize those attributes in some fashion.

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