No matter what, it's a reason why you can't get any large capacity drive at Best Buy. They'd have room for one SKU but can't afford to stock an Amazonian variety of unusual types. I feel the whole industry has gone in a bad direction.
My workstation has a modern case that doesn't really have a lot of room in it for HDDs, so I added an external HDD for my sports photographs. I sure as hell don't get the bit about "serious external HDDs have their own power supply" because it is one more thing that can fail (get unplugged) and cause data loss. I'd get warmer and fuzzier feelings if the drive was powered off USB.