Hey, I'm not arguing with you, I'm just repeating what I read. I'll try to relay what I read as best I can, but forgive me if I mess this up. I'm learning here. The theory I guess is that if you max out the MAFs ability to read the incoming air, and they said this actually occurs in the ECU, not the MAF itself, the ECU essentially becomes blind. It cannot see the boost entering the motor. In high performance applications (not saying mine is one of these) where this can occur, it is safer to use speed density because the ECU can still see the boost coming into the engine during these conditions, and continue to adjust the AFR.
I'm not arguing with you either, giving you my opinion, and just question your question, that did not sound logical.
The maf is more precise at measuring air, than a calculated air mass from baro, and temp.
It is in NA, and forced induction
The ecu does not see boost, and it does not adjust afr, you can run open loop if you want,,,,,,,, it uses air mass to calculate load and deliver correct fuel mass.
There was an issue, in the beginning with the maf, being scaled in the stock strategy, that has long since been corrected, by some smart people, is a non issue now
If you select a maf, that reaches and exceeds 5volts, you picked the wrong maf.