...and a 100 year old lightbulb
I wanted to know, so I had a search and found this piece: https://retrocomputing.stackexchange.com/questions/14314/why-were-most-pcs-and-electronics-beige-back-in-the-day
TL;DR: beige is neutral and matches most things. It was also common for office equipment and home furnishings at the time. More stylish equipment requires a preference on the part of the buyer, so “less stylish” is easy for anyone to buy.
I wanted to know, so I had a search and found this piece: https://retrocomputing.stackexchange.com/questions/14314/why-were-most-pcs-and-electronics-beige-back-in-the-day
TL;DR: beige is neutral and matches most things. It was also common for office equipment and home furnishings at the time. More stylish equipment requires a preference on the part of the buyer, so “less stylish” is easy for anyone to buy.