Just a quick update for this thread. I have dozen of Switches with dead eMMC’s. The latest version of lockpick can retrieve prod keys even without a working eMMC. This can be used to (partially) restore the switch back to life. However, the switch acts like a banned console, so you cannot access the Nintendo’s server (no FW update, game updates, online playing etc.). Using a CFW does expand it’s capabilities though… 
Here is great video how to revive a Switch without eMMC/NAND backup.
