Accounting is a very conservative profession slow to change, so a lot of old school partners at firms still have those big old things on their desk. I worked with a dinosaur for a while who knew exactly how old and out of touch he was and didn't apologize for it. Guy would print things out on paper and bang out a bunch of numbers on his ten key that was older than me. He knew his shit though and was really darn good in his own way, just..really really old..but yes you are right there's no reason except nostalgia or habit.