what is the actual mindset that updates have to be installed in order when all an update is is a replacement of the OS, so a previous patch should have absolutely no mind of what was on the machine before, as the previous gets completely wiped out.
My thoughts exactly ... to an extent.
.... but the only way a previous could hinder a new one is if there is an actual mod being done to the chips which I am pretty sure there are no programmable chips on these. ....
You'd be wrong because the controller board has a programable chip, and the PIC firmware is uploaded on each cold boot (not sure about a restart). I am actually convinced that this is where bitmain fudge things up, as the PIC firmware is obfuscated and no source code available. I have tried dis-assembling the firmware with no positive results as there are only so many hours in a day!
However, I believe the subsequent changes to the PIC firmware are to blame for the sporadic results with the latter firmware, so the logic would be the reverse of sequentially installing updates as the last firmware update wipes the lot off (as you correctly state)!