alt Hacker News> usually because they don’t realize how much more productive keyboard navigation is than reaching for the mouse a lot of the time.
In a large number of cases people who say they are more productive have never measured it. They have no idea if it is true. There are been many competitions between keyboard and mouse navigation over the years. Depending on the details of how the test is written one will win or the other, often by a significant amount, in many cases the loser is the one that user said was more productive before seeing the real results.
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I think that's a pretty reductive stance to take. Keyboard nagivation is more productive _if_ the primary use of the tool is text-based. In a word processor, an IDE, a file manager, or anything else where the primary mode of interaction is reading, typing, and processing the things you've read and typed, keyboard navigation can be demonstrated to be faster and more natural _only if_ the user has taken the time to learn the shortcuts.
For tools that are mainly for non-text visual information, then the keyboard versus mouse debate is much more heavily weighted in favor of the mouse. Even then, there are times when effective keyboard shortcuts are far more useful than menus and icons. Take any CAD or 3d modeling software as an example. 90% of what a user does will be interacting with visually-presented spatial data, but even then knowing the shortcuts for changing tools or modifying a tool's settings will make you much faster and remove the need to constantly navigate nested menus of options.
I think if you need to measure this kind of thing, you're missing the point in the first place. I don't want to be chasing some absolute productivity metric, I want a setup that doesn't break my flow. For many people, reaching for the mouse breaks their flow and feels wrong, which is oftentimes worse than being a second slower, because it takes you out of the mental frame you were in.
For me, using my mouse while I'm working feels natural, so trying to change my workflow to learn how to navigate everything by keyboard would be a huge amount of extra effort just to maybe possibly save a little bit of time in some situations.