Probably because Valve explicitly came out and warned people against using certain parts: https://www.engadget.com/valve-warns-against-steam-deck-ssd-upgrades-1

Probably because Valve explicitly came out and warned people against using certain parts: https://www.engadget.com/valve-warns-against-steam-deck-ssd-upgrades-152550679.html https://www.engadget.com/valve-warns-against-steam-deck-ssd-...