@noiob honestly I haven't really had much of a need for space on most devices, like with my Switch everything's comfortable on internal storage at the moment.
And then there's the Wii U, where a few game updates somehow are taking up 15GB of space. But Nintendo decided SD cards aren't good enough for the Wii U, and a USB drive must instead be sacrificed.
@onfy my Switch was full within months of using it. My Wii U didn't like the 128GB USB drive I gave it (there was always one game that crashed on start, probably the filesystem being awful at error correction) so I gave it a hard drive I had lying around with a cheap SATA USB adapter (with a Y-cable for power)
@noiob Sounds like I need to expect pain. I wanted to try Xenoblade Chronicles X out and then my free space was all NOPE. I don't have any small HDDs... that I'm not using..., and having a hard drive plugged into the Wii U 24/7 sounds like pain.