In Shirobako, the studio has to deliver the tapes to broadcasters physically. I'm not surprised that this is a process, but I am surprised that there's nothing more modern in place.
Early on, we learn that Musani Animation has an FTP server to store their files - So why don't they just send the file over the internet?
I've heard some arguments that physical deliver is still faster, but I'm not sure I buy that - Japan's internet speeds are quite good and the file sizes shouldn't be overly huge as it should be the compiled product rather than files with image layers, audio tracks, cg models, etc all seperate.
Are anime really still submitted by tape? If so - why?