Your tooling isn't just about writing code, it's also about reading, analysis, debugging, research. You think about the code, have an idea, need to look up how something works, think some more, have this constant back and forth. Optimizing your environment minimizes the friction, and allows you to immediately get answers as soon as you have a thought about something, so you don't lose your train of thought.
You also want to be able to run quick experiments, same idea, get the answer to a question you're thinking about as fast as you think of it. And then once you actually know what you want to do, don't you want to have as smooth an experience executing your fait accompli? The primary focus is minimizing friction, and speed is just the observable side effect.
And then of course you can't ignore the natural human enjoyment that comes from customizing things to exactly how you like them.
You also want to be able to run quick experiments, same idea, get the answer to a question you're thinking about as fast as you think of it. And then once you actually know what you want to do, don't you want to have as smooth an experience executing your fait accompli? The primary focus is minimizing friction, and speed is just the observable side effect.
And then of course you can't ignore the natural human enjoyment that comes from customizing things to exactly how you like them.