What motivates you to use a feature rich browser on an OS with graphical user interface running on on-premise hardware including your own internet line and all

What motivates you to use a feature rich browser on an OS with graphical user interface running on on-premise hardware including your own internet line and all those peripherals if you could just use CLI from a good old VT100 hooked up to your nearest mainframe to HTTP POST a comment on HN? Yeah, probably because nowadays you just do it like that.