Yes, USB is necessary since most usb devices are now 3.0.
No, USB 3 is not
necessary. USB 3 devices will work with USB 2 cables, hubs, and controllers, at USB 2 speeds. However, a USB 3 driver is becoming much more important now that many new computers don't have USB 2 controllers. This is likely more important than WiFi.
I am wondering about the encryption that these devices demand that you do. Don't do the encryption and the drive is useless.
The only device that I have seen with "so called" built in encryption was easily fixed. First, you probably want to use DFSEE to image the drive, so you can put it back to the way that you got it. Then, use DFSEE to wipe the front end of the disk. Now, it is just an empty USB device,waiting for you to put proper partitions on it, and format it. There may be something new, that I don't know about.
I was also wondering about WIFI. This is something I have been waiting for a long time.
Yeah, WiFi is about 10 years over due. I do know that most of the project has been done, but other things are taking the developers time.