“Tools don’t make you a better designer” feels like another version of the abused and misunderstood “less is more.”
Sure, the best camera is the one you have on you. But wouldn’t you prefer that camera to also be the best camera for whatever it is that makes you tick – a great sensor or glass, an amazing build quality, a friendly user interface, a logo that makes you want to step up, or some particular quirk or sentiment that you can’t even explain, but matters a whole lot to you?
I’m told I should be annoyed if someone’s first reaction to seeing a nice photo I made is “what kind of camera do you use?”, as it diminishes my accomplishments as a photographer. But: I chose the camera, and bolted on the appropriate lens, and realized over the years the aperture priority mode and very precise focus area is what makes my brain happy.
Maybe it’s the 1960s typewriter you need, or a newfangled e-ink-based writing implement, or maybe you just have to open TextEdit and close everything else. I’m not going to tell you the novel comes out then. But the novel might never come out if you don’t figure out what tool can help get it out of you.