- This study show that all caps is not harder to read than lowercase.
Engineers and architects often write in all caps. Does this increase the legibility and visual impact of text?
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You are misrepresenting the claim. From your link [emphasis mine]:
All capital (uppercase) letters are slower for people to read, but only because they aren’t used to them.
Even if the idea that word shape doesn't explain the empirical results, that doesn't make those empirical results incorrect. In normal circumstances, people read mixed-case faster. I see nothing in the article contradicting that. It. The key word that you've omitted is 'inherently'.
In other words: mixed-case is easier to read in practice but not in theory.
One of the articles referenced does assert at least one advantage of ALL-CAPS [emphasis mine]:
is the result that upper-case text is more legible in terms of reading speed, for readers with reduced acuity due to visual impairment, and in normally-sighted readers when text is visually small.
When you are writing in a hurry, taking notes during a lecture or presentation, we take several short cuts.
Engineers, at least, attend "lectures" of some sort or another about every other working day. It is not an unusual week to have 5 or 6 coordinating meetings with fellow engineers on the same project and/or management supervising the project and/or end-users of the project, all of which may require notes.
I've worked with software and firmware engineers, electronic engineers and mechanical engineers.
All Caps increases clarity; there are a limited number of shapes to recognize when those are written in a hurry so the guessing game later (going over your notes) has fewer choices; and if case actually matters (as it might for some technical purposes) you can just make the capped letters large and the lower case letters small.
It is also common to abbreviate words (abrvt wds). Cursive script is "fast" but often becomes illegible in a hurry, Caps less so.
It is not unusual at all in meetings to see everybody, including the manager or presenter, with some sort of notebook or paper they can take notes on.
When your job is inventing new products, your entire career is basically a learning environment and every meeting is like a class you are taking or a class you are teaching. Bring a notebook.