> The average developer averages 10 lines of finished code per day. And even with a raw 10x that amount to account for variance, changes, debugging etc, you'd be at 12 lines PER HOUR. Being generous at a full 80 chars per line, you have a maximum of 1000 keypresses per hour, or an average of one every 3 seconds. Even doubling your typing speed or keyboard response time would have no discernible effect.
Just my personal experience, it's not about how fast I can get my ideas down in writing (whether code or not), it's about how often I am broken out of the flow when typing.
At one extreme, using your stats above of "10 finished lines of code per day", you could argue that using this keyboard (https://www.youtube.com/watch?v=9BnLbv6QYcA) should have no effect on your productivity, and yet no developer would make or support this argument.
Small frictions add up; there's a joelonsoftware post that I read a long time ago about this[1], and it stuck for 24 years!
The best editor/environment is the one that gets out of my way. One where I don't need to look things up on google. One in which I have already learned all the shortcuts, and don't need to relearn them to make the software useful.
Emacs `M-x sql-connect` is much easier for me to do than to look up, in VS Code, what shortcut has been assigned to the extension I use that does the same thing, and then look it up again in a few years when that extension is no longer supported. Same for Vim commands.
Using VS Code, or a full-fledged IDE[2] removes the whole command interface: I now need to remember dozens of key-chords, not a handful of verbs and a handful of nouns. I need to remember which menu, and which submenu needs to be clicked.
Each time I want to do something in the IDE I switch focus from the code to the IDE. When in Vim or Emacs, that never happens!
The "keyboard maximalism" isn't about speed == productivity, IME. It's about "friction == disruption".
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[1] From https://www.joelonsoftware.com/2000/04/10/controlling-your-e...
> So that’s what days were like. A bunch of tiny frustrations, and a bunch of tiny successes. But they added up. Even something which seems like a tiny, inconsequential frustration affects your mood. Your emotions don’t seem to care about the magnitude of the event, only the quality.
> And I started to learn that the days when I was happiest were the days with lots of small successes and few small frustrations.
[2] Which I use daily, btw. I'm not knocking the developers who use IDEs.