EDIT.COM and MS-DOS installers too had blue background. In fact, blue (CGA colour 1) was a very popular background colour for many tools. For example, white on blue was a popular colour theme for Turbo Pascal, Turbo C, etc. Borland dBase had a mixture of blue and cyan background colours on various screens. With the limited number of colours available back then, blue was one of the few background colours that was easy on the eyes.
Also, you are right indeed. I remember Windows 3.1, 95, 98, etc. used blue as the screen colour for icons depicting computers. For icons that had two computers (e.g. "Network Neighborhood"), one computer had blue screen and the other one had cyan.
I believe, you and I are talking about the same colour when I say "white" and you say "light grey". Specifically, I mean colour 7, and I believe you do as well. In the CGA and EGA palettes, colour 7 is commonly called both "white" and "light grey."
Colour 15, on the other hand, is typically called "bright white" or "high-intensity white", which is indeed too saturated. When I said "white," I was referring to colour 7, not colour 15.
I think you’re right. NSCA Telnet was by far my most used floppy disk until I got a network connection in my dorm room.
My roommate sweet talked the housing people into letting us have a second land line (ethernet was still being piloted in a different dorm) so we could log in from our room. It’s a wonder that I was surprised when he ended up in management.
Also, you are right indeed. I remember Windows 3.1, 95, 98, etc. used blue as the screen colour for icons depicting computers. For icons that had two computers (e.g. "Network Neighborhood"), one computer had blue screen and the other one had cyan.