That's the thing. There are many who still "have to".
Wifi access is not a given for everybody in all situations. If you're on a flight, or on a highway (especially here in the sprawling southwest) there are many times when one doesn't have access to wifi and by extension, the cloud. Cell data capabilities in tablets and laptops aren't that common and are still prone to deadspots.
There are times, like when meeting with a customer or client and they have data to share on a thumbdrive. At that point it is easier to be able to take the thumbdrive and pop it in and copy the file rather than have them upload it to the cloud, make it shareable, give the person the link, and then have to download it.
There are many more scenarios where wireless is just inferior to locally stored data.
In this cloud universe where physical media is a distant memory, are you making physical backups of your data or are you relying on dropbox, OneDrive, iCloud, etc. to preserve your data?
No solution is universally superior in all situations, but unfortunately there is this drumbeat of "wireless is now, wireless is the future, get out of the stone age" that ignores the reality for many.