One would hope they learned from the mistakes of the Wii U - and based on their first release about it, and supporting backwards compatibility, it seems they have.
The switch 2, as shown so far is much closer to the original switch’s design ethos than the Wii U was to the original Wii. In a clear marketing mishandling, many people didn’t even know the Wii U was something separate from the Wii. A lot of people thought I was an accessory
Just like the Wii U sold extremely well after the massive success of the Wii.