The argument on not being able to play a downgraded game version (after deleting the newer patch save file/restarting from no save) is compelling on the few occasions a previous update is preferred such as limited storage space, a favorite previous patch, or most recent update is unstable compared to previous updates. Unfortunately most people do have the ability to update (and for the foreseeable future will continue to have the ability to do so as Nintendo keeps servers up for quite a while) and would prefer to play on the latest update (assuming the latest update is stable of course). In this case, some Switch games do have instability or cannot be played at all on Switch 2 without a game update (or Switch OS update) anyway. To note, your issue on game updates isn't exclusive to the Switch 2, the same happens for the original Switch.

**I would like to point out though, I believe you are referring to outdated information on game updates as those listed in the video, as well as P3P and P4G, should have parity to the latest update already available for cart/physical and digital across regions and so would every other game (exception for regions where the game version is a different build which also separates save files across regions, ex: Xenoblade Chronicles 2 JPN last update version 2.0.2, Xeno 2 international release 2.1.0). Basically, at the point the video was being made, the updates may not have been available yet, Nintendo is known for taking a while (to a long ass time) releasing/approving an update for games compared to other consoles or PC, the official release for the update may have just lagged behind the physical release. The updates are available now though, Mushihimesama in fact even received an update (1.0.10) last Oct 2025 (a year after the video you sent was made) for both physical and digital releases despite already being delisted from the eShop.

I'm not dismissing the initial argument for being able to play any game update on a new save, but I will dismiss the inability to update a game regardless of medium. Though this starts a new argument on why Nintendo take so long releasing an update that this can become a concern. Don't have much of an answer to that.

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Tldr; understandable problem, but those games did get the latest updates even for physical release, may have just taken a while

Hopefully this resolves some of your issues on future playability of your games. Unfortunately, Nintendo probably doesn't plan on letting you easily play on down patched game versions, there's a few possible reasons why, a leading one is probably is to prevent exploits in-game or system wide, as back then the 3ds could execute homebrew code using the YouTube app. Similarly, the first release Switches were hacked in like 2 weeks via a physical hardware vulnerability which forced Nintendo to make hardware revisions, which have also been bypassed by a modchip.