Fair point. GUI is definitely faster for putting together an invoice (i.e. on paypal). However LEWT is all about extracting your data from existing sources and

Fair point. GUI is definitely faster for putting together an invoice (i.e. on paypal). However LEWT is all about extracting your data from existing sources and processing it, I maintain my invoicing data (hours worked) directly in my google calendar now so I manage that all in a GUI. I use LEWT to pull and process that data. I agree that monkeying around in a CLI isn't always great, for me however the convenience and time savings comes from only having to maintain my data in one spot. To try and answer your question - its CLI for expert convenience, it has an API so it can be wrapped in a GUI of your choosing at a later stage.