"The quote that you linked seems to suggest a lot of rework for nothing, and I don't buy it."
They increased the number of pipeline stages by two, or 20%. That would mean a general re-balancing of all the resources including the execution units. If not, they become a major chokepoint and a likely target for a re-work of the core. I don't think you would find any competent design team that would do something like that...
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