This has probably been posted before, but I did a quick search, and didn’t see it.

https://www.nintendo.co.uk/Iwata-Asks/Iwata-Asks-Nintendo-3DS/Vol-1-And-That-s-How-the-Nintendo-3DS-Was-Made/2-Shigeru-Miyamoto-Talks-Virtual-Boy/2-Shigeru-Miyamoto-Talks-Virtual-Boy-229419.html

I haven’t read that piece for a while. A lot of interesting points are brought up from marketing to niche toys.