On Switch, no game cards support writing of save data or anything else. It’s a departure from 3DS and all previous Nintendo cart formats for as long as games have supported saving at all.
That change is probably done to help tie saves to user accounts, enable cloud saves even when the card is not inserted, accommodate variable-size user data features like level creation, and mitigate the risk of game save based exploits like Twilight Hack spreading from user to user.
Unfortunately that (plus inability to put saves on SD card) means that backing up your own save data requires either being able to run homebrew on the system that has the save or having another Switch that can and relying on Nintendo servers to perform the transfer. Either way, having a Switch that runs homebrew means you don’t need this dumper.
There actually is a silent and very subtle revision they made to the dpad less than a year after Switch launched (iirc around the time of the Xenoblade 2 controller). The protrusion out the middle of the underside was made slightly longer, which makes you less able to push down all four directions at the same time. The chance of undesired diagonals is very high either way but just slightly lower for the newer one.
Even the improved version is one of Nintendo’s worst dpads ever (including handhelds) imo, with only the GameCube’s coming remotely close. A huge step back from Wii U Pro’s dpad.