...and Tetris! Breakout, too!
On a more serious note, I've see these testers made into SMD test tweezers, so small displays are not as useless as they may seem. In addition, in some parts of the world certain components are easier and cheaper to come by than others, not to mention that you may just want to get the tester to work with the components that you have in your junk box (even if that includes an old phone).
The SMD tester that I looked at was using a tiny 16x2 screen. I was unpleasantly surprised to find out that m-firmware no longer gets updated for it. The k-firmware still uses "-ww-" (looks very strange to me) for coils and has other little things that make me prefer m for 16x2 and k for graphical displays.