[Crinus]

I think a more likely reason is keyboards. The main input device we use to interact with computers is a typewriter descendant, optimized for typing text. Mice are flexible but keyboards allow for more complex input.

Touch devices (like touchscreens or touchpads) could have helped with more direct manipulation of visual elements but they are always used on very limited (in terms of functionality and form factor) systems. On desktop computers they are far from ubiquitous and 99% of the time they just act as subpar mice.

[jerf]

I've come to think that one of the other problems non-textual approaches need to solve to win at scale is that they need to somehow get rid of their coordinates. Right now, most of the non-text oriented approaches I see mean that I have to not only understand the same thing I'd have to understand in a textual representation, but I also have the additional complexity of all of my code having coordinates in a 2D space, and then if you start drawing lines on the screen for relationships, additional accidental complexity in the state of the lines too.

The more I think about it, the more I think the people who tend to make criticisms about textual representations and then argue in favor of visual representations are not just wrong, but usually have things actively backwards; almost every criticism they make about text is actually a positive aspect of it. Not having a literal line appear from a call site to what it is calling, for instance, is a net positive, not a problem. I think this is why visual stuff has been bubbling slowly for decades and just never seems to get anywhere the way its advocates hope.

[scroot]

This must be a big part of it. Another is the kinds of computing environments that the majority of users, developers, and even CS researchers live and work inside of. For there to be truly new UIs the question of "what is symbolic representation in the medium of computing" (that is beyond written text) needs to be taken seriously, and that's just not going to happen when everything is Unix

[zokier]

It's not that clear cut. Large portion of programming activity already involves keyboard shortcuts etc rather than straight out typing code. I'd expect any good non-text based code editor to still be fully keyboard driven, or at least as much as current-day editors