Massive popularity of Indian accounting software tally is because of mouse-less handling of the whole interface. Mouse uses three organs while keyboard uses only one.
Many of the older core banking systems were keyboard only, because it made the tellers work a lot faster.
I know because I had been on some of those unfortunate teams that transitioned to GUI that required to use the mouse and the teller's productivity decreased terribly - something that took 30 seconds ended up taking almost 4 minutes, and seeing this, the banks refused to transition to the "new and advanced" versions, until the old charmode UI was slapped on it again.
