"Why does inelegant design persist for so long? This is called the legacy problem.." #readingToday
Why does inelegant design persist for so long? This is called the legacy problem, and it will come up several times in this book. Too many devices use the existing standard—that is the legacy. If the symmetrical cylindrical battery were changed, there would also have to be a major change in a huge number of products. The new batteries would not work in older equipment, nor the old batteries in new equipment. Microsoft's design of contacts would allow us to continue to use the same batteries we are used to, but the products would have to switch to the new contacts. Two years after Microsoft's introduction of InstaLoad, despite positive press, I could find no products that use them—not even Microsoft products.
Design of Everyday Things Revised, Don Norman