I'm pretty sure I said earlier that lots of great musicians can't read music. That doesn't detract from their performance abilities. It detracts from their ability to write down what they played. It detracted from their ability to teach others. Inspire others? Sure. Teach others? Pretty limited. Beiderbecke would have been a far better musician if he could read because how much did he come up that he never had the chance to play for anyone that he could have written down but now we'll never hear it?

You can be a great storyteller but if you can't write your stories down, all you can hope is that they get retold exactly as you told them and that isn't going to happen. By the fifth retelling, there's not likely to be much of anything of your original story left.

It's always better to be able to read and write--whether music or words. It's always better.