The Crimson Binome
Hero
Attempting to vary the ability score for a skill check will generally create more problems than it solves. For one, it creates uncertainty for players. They think a skill should use their high stat, but the DM says it should use some other stat, and now they have to reconsider their entire plan of action.
For two, it reduces balance between stats even further. Why would a barbarian even consider raising their Charisma, if they can just argue for Strength on any check they actually care about? And if the DM disagrees, then it makes them seem like the bad guy.
And for what benefit? Better verisimilitude regarding elephants? That's why Rule Zero exists - for ridiculously obscure corner cases.
For two, it reduces balance between stats even further. Why would a barbarian even consider raising their Charisma, if they can just argue for Strength on any check they actually care about? And if the DM disagrees, then it makes them seem like the bad guy.
And for what benefit? Better verisimilitude regarding elephants? That's why Rule Zero exists - for ridiculously obscure corner cases.