Dice can be useful to randomize letters, say, when you’re making a cipher, or trying to write fantasy or science fiction proper names. Ojmwrgm, the pirate, for example.
Unless you’re trying for something like Drizzt. Or any other name requiring a Q, U, V, X, Y or Z. This is just a 20-sided die, after all. (Though they keep the C, K and S, when they could have left out the C as redundant. English is weird.)