There are various reasons you may wish to use it on another computer, and you may have the cartridge, but if you can't dump/decrypt it, then that won't work, so they will need to figure out how to work such a thing, so that if you do not have a compatible Nintendo Switch system then you can still dump the cartridge and use the necessary keys to decrypt as needed.

Pretty much every single switch game has already been dumped and will continue to be dumped and every single game +updates fits on a 5TB HDD. And I've never heard of any particular RCM vulnerable switch not being able to play specific switch games either.

So what you've said doesn't make much sense to me.