It’s replaced their handhelds as well as home console and they merged both divisions when it came out.Switch is surely more of a home console than a handheld. Whats their record of backwards compat with home consoles?
Wii U could play Wii games and some Wii models played GC games. They usually went for different cartridges/discs between next iterations which made it difficult. Switch has the upside of having all the digital content easily transferable and the card readers for current carts are extremely cheap so no extra cost of having it in there.