I figured no one is spinning platters any more.
That is an extremely bad assumption.
Though SSD is common in new computers, lots of frugal people continue to use old HDD-based computers, also some desktop users have a 2nd or 3rd high-capacity HDD inside their computer, as well as external USB drives too. Seagate is currently sampling 30 TB hard drives plus road maps up to 50 TB, thus spinning platters is far from dead both now and years from now.