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Firmware updates replace each other. As in, completely. They don't accumulate and shouldn't cause anyone to run out of space. It's a little weird to see people thinking otherwise but I guess the idea of large firmware updates is new to many.
Brian Crecente with Polygon said his system loads faster now.
Digital Foundry confirmed on Twitter that there's no difference. I suspect that a lot (perhaps most or even all) of the load time improvements people are reporting is perception rather than reality.