We have been using 80 columns for over 80 years , thanks to IBM punch cards. This is the default text mode on the PC, and this is the default terminal window size. Saving rows under 80 columns means that they can be displayed unpacked in these environments.
I believe that Visual Studio defaults to 120 columns (although you can change it ), which, in my opinion, makes more sense, given the name of the LongVerboseDotNetCompliant conventions. When working in an IDE, this is pretty common to maximize it, so a limit of 80 columns tends to reduce space if you don't have a lot of sidebars.
72 ( HTML, Python ..), .