[Klashikari]

Regarding different games with unique signature, it is pretty much done that way because the switch doesn't consider those games as the same. For instance, I have both JP and EN versions of Xenoblade 2, and they appear as 2 different apps in the switch, which is pretty normal since they don't have the same features. So it isn't like you buy the "same game" with locked stuff because of the eShop: it is more like they are tweaked versions and cannot be considered the same app at all.
And obviously, those games are only available in their respective eShop for logical reasons, but they are still purchaseable for any switch.