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.
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.