The limit is imposed by the OSM API itself, and it's a matter of how much data is already mapped in the area you're requesting -- a max of 50,000 nodes according the API docs. Of course data density varies wildly across the planet, so you can expect to fetch a lot more acreage in rural areas than in urban ones. But there's no way to know if a particular bounding box call will succeed without trying it out.
Editing software could be generally aware of high and low density locales and advise accordingly. And it could subdivide a large request into smaller ones. But the JOSM developers prefer to offer a closer-to-the-API experience.
As a beginner use the editor built in on the website instead (called ID). JOSM is a great power user tool, but this article's recommendation to use it for your first edit is misguided.
OK, but what about visualizing numbers, words, formulas, graphs etc? Do they count? They have no color, no characteristics other than the text/logic content, yet I visualize words and numbers all the time.
It depends on if when you visualize e.g. an "8", you visualize something like a lemniscate turned 90 degrees, or e.g. visualize a number line, e.g. maybe a straight line with dashes at the 7, 8, 9, and with these dashes having e.g. some visual label, and so on.
I.e. if your "visualization" of eight is something like a picture, such that I can show you various pictures and you can say "yes, my visualization is sort of like drawing A, but also has such and such elements from drawing B", and so on, then, yes, this is clearly not total aphantasia. But if no such picture could ever have any similarity to your visualization, and you are somehow just experiencing some kind of non-pictorial "logic content" here, then, yeah, that sounds pretty aphantasic to me.
> The area you tried to downlaod is too big or your request was too large.
And no indication whatsoever of how big the area should be, I'm at my fifth attempt so far.
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