I recommend Fire Emblem, Astral Chain, Tetris 99 and Voez (maybe smt V in the future)

Splatoon 2

How does one recommend a few of those as must haves, when they are not even released to know yet?

BOTW not considered as an exclusive then?

Why have you listed games that weren't released ?

Technically it and Mario Kart 8 are on the Wii U, but that’s more or less a technicality considering the reality of the situation. 

The Wii U was a dead console when Breath of the Wild launched. It’s a Switch exclusive for all intents and purposes.

Mario Kart 8 Deluxe’s features set it leagues ahead of the Wii U version. The portability and vastly superior multiplayer of the 8D make all the difference. While they share much of the same content, the experience is very different for everyone taking advantage of the new content and features. The Wii U version is effectively a mediocre update to Mario Kart Wii. MK8D on Switch is a killer app.

Agreed. i suppose it depends on the context of the discussion. Both MK8D and BOTW  are must-haves imo but i suppose technically they are ports. even though i'm pretty sure BOTW was a much bigger HW mover than the Wii u version, which is pretty much redundant, also imo.

Happy to see Astral Chain on here, I love that game, it always reminds me of a mix of a classic P2-era game and 90's anime or something.

I consider my library to be kind of "definitive" for users who want a Nintendo experience without going too much into Niche games:
The Legend of Zelda BoTW
Mario Kart 8 Deluxe
Splatoon 2
Super Mario Odyssey
Super Smash Bros
Super Mario Maker 2
Luigi's Mansion 3
Animal Crossing
One of the Pokémon games
And the unreleased trio of hyper anticipated titles: Metroid, Bayonetta and the new Zelda
From games that I don't have but people deem to be "must haves": Fire Emblem and Astral Chain.

Here's another exclusive: OkunoKa