exponential nature of technological development
If only it was that easy in aviation. Working with a few "glass machines" over the years it is far from easy even to get something minor changed and released.
e.g. EC135P2 - new config file to change ALT BARO from in/hg to hPa.
7K Euro! As the avionics installed were slightly different than standard and the file had to be written, tested and released.
My experience from "tapes" and "round dials" is that "round dials" don't require you to read the numbers. The angle of the needle is enough.