Eh, I'd consider myself both a visual and narrative storyteller. I want to improve at art in order to tell my stories, and I want to improve at writing in order to do my stories justice. Of course it takes time to develop the skills, but it's not like you need to first spend years writing, and then years drawing - you can do them both simultaneusly! In fact making comics is a great way to do so!
Not that there's anything wrong with just focusing on one part of the process and becoming really good at that, but I wouldn't claim it's "better" than any other way to do it. So many people are creating their own passion projects alone, and many are making great comics like this, so clearly there's nothing wrong with that.