Same reason why I need a UART plug externally accessible

Its a cyberdeck, the more questionable the features the better, because then you can make up silly scenarios about saving the world with it, e.g. doing a direct audit of the network hardware in a datacenter, plug in your serial cable, download the running/stored configs, beam them up to some wifi accessable server, plus generate a paper backup at the same time

or, log into your deck at the start of the day, as you are reading the morning news, you get a printout of today's todo list and agenda

etc, its a lifestyle meme, not a computer