As a developer my most important tools are a computer with working keyboard, monitor, and mouse. Everything else is secondary. A notebook and pen falls somewhere below cpu, gpu, hard drive, ram, reliable internet, etc.

I agree with parent comment of notebook and pen being pure romanticism. I mean, heck, I'd rate Obsidian or some other back linking note software as more important than a notebook and pen. A sticky note and pen would be even more important than a notebook and pen.