the number of *American* printers that can print large books has decreased by two—bankruptcies, both of them. In fact, there are only two firms remaining in the U.S. that both have the presses to print on thin (30# to 40#) paper *and* that can do sewn bindings of books of 1,200 pages or more.

The thing is that each UI decision depends on countless other UI decisions. A simple example is keybindings. On UNIX/Linux, it’s nearly impossible to pick reasonable default bindings for global desktop navigation because they all conflict with bindings that some app is using. On Windows, the desktop navigation bindings are hardcoded, and no app uses them, because apps know for sure which bindings to avoid.