The official Nintendo update process is linear: You install the base game, then download Update 1.0, then 2.0, then 3.0. If you miss one, your save data may corrupt. A repack bypasses this by merging all updates into a single NSP or converting them into a super-XCI.
The "Update 30 Repack" advantage:
Version 3.0 runs flawlessly on original Switch hardware, Switch OLED, and Switch Lite. Emulation performance (Ryujinx) requires a mid-range PC for 60 FPS in 4-player split-screen. The repacked XCI versions exhibit identical performance to standard installs. mario kart 8 deluxe switch nsp xci update 30 repack