It's perfectly okay if you are. And if you aren't then there's some place between "it's okay for missiles to use Series/1s from the 1970s" and "it's okay for people to use a 2 year old phone." Might be interesting to figure out where that point is.

For what it's worth, I think it's perfectly fine for US Nuclear Missiles to use IBM Series/1s, even with Floppy Drives. I had this wonderful idea that somewhere in the mountains was an old guy hand-winding copper wires around an iron core to manually make a read/write head for a floppy drive to sell to Raytheon to sell to the DoD to replace worn out IBM floppies from the 70s.