X was built on false assumptions of what the future would look like (dumb terminals). The whole thing is a massive hack around its server/client architecture -

X was built on false assumptions of what the future would look like (dumb terminals). The whole thing is a massive hack around its server/client architecture - which does not work well with modern graphics hardware. It’s no small part of why Linux has failed on the desktop. In short, lack of tests are the least of its problems.