3 points
Also some people are color blind.
Also you might need to ssh in somewhere and vi some code or tail a log file where you don’t have color support.
1 point
My ide isn’t limited to color when it comes to highlighting, so being color blind generally shouldn’t be a problem. Set keywords to underlined, bold, italic, whatever works for you.
Your other examples I can see, but at least at my work those are rare edge cases, and I’d rather optimize for the brunt of the work than for those. Of course at other places those might be much more of a concern.