For the most part it's going to be Breath of the Wild, and the rest are people who haven't played Breath of the Wild. Also,
Also, complaining about arbitrary generation numbers is silly. The concept of unified gaming generations is outdated and inaccurate anyway, and has been since at least the PS2 generation. We know when people say "8th gen" they mean current consoles.
But truth be told, this is actually the 7th home console generation for Nintendo, the 4th for Sony, and the 3rd for Microsoft. Calling this the 8th generation, and saying Wii and Switch are the same generation is as silly as the 2 mystery generations prior to the NES. Those oddball groupings of consoles on Wikipedia for generation 1 and 2 are mostly fabricated by video game journalists who really were just making shit up. They were likely trying to answer the question "were there generations before the NES" with conjecture, that isn't actually reflected within industry history. The concept of console generations began when Sega and Nintendo began marketing their 16-bit consoles, and the 8-bit generation was recognized as the first. Often Atari 2600 was lumped in as an 8-bit console, but not always, because Atari wasn't' significant by the time console generations became an established thing.
Either way, while PS4 competed with both Wii U and Switch, it doesn't mean it is of the same generation as either of them, and it doesn't mean Switch and Wii U are the same generation - this is logically impossible considering Switch is the generation after Wii U.
I describe myself as a little dose of toxic masculinity.