Here's a little tidbit to put Switch software sales in perspective. There are six different first party games on Switch that have outsold every single PS4 exclusive game since the platform launched. That's not combined sales, but sales for each individual game.
The best-selling PS4 exclusive is Uncharted 4, which moved over 16 million units. Here's the Switch titles that have managed to outsell that PS4 exclusive.
Mario Kart 8 Deluxe - 26.74 million pcs.
Animal Crossing: New Horizons - 22.40 million pcs.
Super Smash Bros. Ultimate - 19.99 million pcs.
The Legend of Zelda: Breath of the Wild - 18.60 million pcs.
Pokémon Sword/Pokémon Shield - 18.22 million pcs.
Super Mario Odyssey - 18.06 million pcs.
Obviously impressive figures for all the titles listed above, but the real show-stopper is Animal Crossing: New Horizons. That game managed to outsell Uncharted 4's total lifetime sales in just 3+ months!