Lets go back to your statement, thousands of macbooks, iphones and iMacs? Please backup your statement of fact.
This number is literally underestimated.
I'm not going to talk about NVMe SSD upgrades here (I contributed extensively to the thread
here).
I'm going to limit myself strictly to talking exclusively about upgrades of NANDs soldered and glued with epoxy on Apple hardware.
Whether they are BGA60s from iPhones 5 to 6, BGA70s from iPhone 6s to 7, BGA110s from iPhones 8 to 13, and BGA 315s from iPhones since 14, in Shenzhen, Thailand, Vietnam, and Malaysia, dozens of repairers have been each one replacing hundreds to thousands of soldered NAND chips on iPhones on every street corner for the past ten years or so.
In the US, I can obviously mention Colin (
@dosdude1 ), in France I personally know at least two colleagues (Quentin Wagner and Jean Amaral de Oliveira), and in Germany Stephan Steins and Robert Lindeneau.
All workshops and repairers use NANDs that are absolutely original, either new or used (pulled).
Whether they are Kioxia, Hynix, Sandisk, or Samsung brand, all of these NANDs are "plane" TLCs supplied by the manufacturer but incorporate an Apple-designed ARM processor CPU in their package that is common to all models., currently in version "S5e".
NAND compatibility is very strict, and "compatible", not genuine, NANDs cannot be used under any circumstances to this date.
Only original NANDs of specific models must be used.
I am publishing a compatibility table
here.