Having your concentration broken when you're trying to solve a tricky problem can be a huge productivity drain. So in the end, an editor which may only save a keystroke here and there on average can end up being very productive for some people.
> d), d{
That's not two different commands, it's one action (delete) and two different motions (forwards one sentence, backwards one paragraph). Motions work on their own for moving the cursor, but can be combined with different actions and repetitions to multiply the sentences (commands) you can make. As you increase your vocabulary over time (there are a lot of motions and selectors (which are slightly different but used similarly)) you can keep reducing that friction between thought and screen.
As someone down below mentioned, programming is not as much editing text as it is massaging the underlying AST. Proper IDEs (not VSCode) in a hands of a power user who knows what his "hammer" can do (and how to invoke the necessary behaviour) are much more efficient at it compared to any text editor.
It was about minimizing the number of redraws, but this indirectly might have led to fewer keystrokes too.
As you mention later in your comment, there are a lot of motions (which could be combined with deletion too). This is probably related to performance too, because they make it possible to achieve something quite specific like c3), with only a single redraw, and three keystrokes.
The "language" is undoubtedly a very good choice on part of Bill Joy. It wasn't necessitated by the hardware constraints, I believe. The separate modes neither. It's just that he would have wound up with less ergonomic key mappings.
Without the modes we would have to suffer using chorded shortcuts with modifiers, but they could still form a language. Think "M-3 C-d C-)" instead of d3).
Without neither modes nor composition (the "language"), it would have been even worse. A large number of single-purpose shortcuts, likely with multiple modifiers; he would have run out of (memorizable) single modifier combinations.
But if the 1980s UI Scientists came back with their stopwatches, I don't think the median vi-mode user would "win". Unless they were using a really slow terminal. (obv, we probably have some 1%ers on HN)
I know that I, personally, would not have been able to take some of the notes I took in university if it weren’t for vim and its affordances. Trying to keep up with a fast-writing math professor while typing a complete set of notes in LaTeX would not have been possible otherwise!
I imagine Vim is only just a local optima too. There are newer editors [0] that are more AST aware that I haven’t been able to fairly evaluate yet (not in the boring corp approved software list).
