...less of a writer than someone who reads a whole lot. There are a few reasons for this problem that don't feel like excuses, and I get folks who think it's an ableist thing.
But I also think the argument "a writer must read" points to a true thing.
If you want to tell stories, you have to get a sense of how they work and how certain choices affect the audience engaging with them.
Reading other works gives writers an invaluable look at how others put stories together and how we're affected by them. It's grounding.