This has always been a thought for me, like, I typically like to write it with pencil first, just because I recognize my handwriting and literally 'write how I think,' but the issue with this is that I then have to type it out for, ya know, submission.
I did the National Novel Writing Month a few years ago, and to save time, I just typed it out, and the prose is not too different than my handwritten stuff, but there's definitely a quality variation.