I am an artist, both drawing and 3D design, and my handwriting is a mess as well. I suppose it is because I do not see handwriting as an extension of my visual inclinations. Speaking for myself, a drawing’s or a 3D rendering’s/animation’s primary purpose for the artist that creates it, is to be looked at and to be enjoyed, the information component that it contains is just something the client wants. Written text however, if not part of that artwork, is just a chore, existing solely to convey information, and it is completely irrelevant to me whether it looks nice or not.