Story and gameplay separation. In this case optional. If people want to make/change character like that they can, narrative wont change around them tho.
I get what you're getting at, I think, but respectfully this is just a bad take imo. For three years Larian's been constantly promoting what astoundingly deep choice & consequence we can expect from their game, how much reactivity they're implementing, how many unique interactions and dialogue options there will be depending on your race and class, all to make the game respond organically to the character you choose to play. What's it all for if I can change my decisions on a whim? Whether my character is a tiefling druid or a dwarf cleric of Tyr reflects their background, their past, their entire life.
It's the commitment to your choices that gives them weight and value. Removing that commitment absolutely also cheapens the choice absolutely.
