There isn't a technical reason to change the cartridge format. I don't see why they wouldn't just use the same carts if backwards compatibility is the goal.
Because they can get more money by selling the same game twice. But they can still claim backwards compatibility with download-only games.
There are now cart dumpers that can copy and store multiple Switch games on an SD card. If the same form factor is used its likely these will still work for original Switch games.
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there always is:
- smaller
- energy efficient
- cost saving
and they are all valid reasons, it's a handheld, the form factor will evolve until perfected
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