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Until fairly recently (in IEEE/OUI terms, ~2012), the distribution has been entirely sequential. FTA:

"I believe IEEE changed their strategy to attempt to purposefully higher the chance of collisions with MAC squatters, to encourage people to register and pay the fee"

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Nonetheless it was a broken parse: they needed to expend the memory to figure out what the actual protocol is and not jump up from the datalink layer if it's not called for. I guess I'm just saying I really can't blame IEEE here.

Oh, I don't blame the IEEE wholly - but I think that they probably changed tack after realizing that a number of manufacturers were simply not paying the fees to actually be assigned a block of OUIs. I view it as kind of a cudgel to be used against vendors, and end-users (read: netops/sysops) are caught in the middle.

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