Switch 2 can use a regular SD card, but it is limited to screenshots and video captures. No games can be stored/accessed on it while in use on Switch 2, which includes Switch 1 games. And because the Switch 2 is a completely different system, you can't just download your Switch 1 titles onto the card from a Switch 1, and then insert it into the Switch 2 to access them. They are encrypted by the system's unique signature. Tied to your Nintendo Account, but encrypted by your console.
I was talking about taking a microSD Express card (the new kind) and formatting it FAT32 with a PC SD card reader/writer and seeing how the Switch 2 reacts to it. Because the new cards are compatible with old reader/writers, it should format no problem. To see if it's less limited than just inserting an old type of microSD.






