I don't follow gaming news closely, so when I heard of the Wii U I thought it was a hardware revision not unlike the Xbox One S to the Xbox One. It took me over a year after launch to learn that the Wii U is an entirely new console.
The same thing happened with the 3DS. When I finally looked into getting one this past holiday season, I was confused by the 3DS vs 3DS XL vs New 3DS vs New 3DS XL. I was hesitant to buy since I wasn't sure if the New 3DS was a hardware revision or an entirely new console like the Wii U.
On top of that, the marketing wasn't there for me. I learn of my gaming news when it hits the front page of Reddit. When the Switch was announced, there was massive hype behind it. I didn't see the same for the Wii U.