What's the point of using hypertext-(web)-standard-oriented multimedia-capable framework to create an application that just shows plain text (ok, plain text + 1

What's the point of using hypertext-(web)-standard-oriented multimedia-capable framework to create an application that just shows plain text (ok, plain text + 16 colors + bold). Why would one package a 50MB terminal, packing stuff that will never be needed in a terminal. It would make sense if they were to spend all that effort to create a terminal-based web browser.