Newer machines still have floppy drives, or in some cases now a USB socket for thumb drives. Like has been mentioned already though, like aviation it's a conservative industry and change happens slowly rather than chasing fads. Machines have a typical operating life of decades so if you have a shop full of hundreds of thousands of dollars worth of machines all set up to use tape readers because that was high tech when the machines were made in the mid 70s and your operators are all trained to work with the tape readers, then you typically keep running the tape readers long past when they have been superseded in other industries.
Likewise if you bought machines in the 90s when floppy drives were high tech, you might still be using the floppy drives today because the machines are still serviceable, they represent a major investment and any time the machines aren't running that's money not being made. There's no business value in upgrading something that works just because something more high tech is available. The G-code to make a complex part is a few dozen kB of plaintext, a floppy disk is still perfectly adequate for transferring that from the CAD station to the machine.