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The typical drain and fill is probably more like a 50% change than a 70% change. Do it a second time and the percentage increases slightly but the returns are diminishing. Better than nothing.
There are ways to fully flush but I have not seen them detailed for these cars yet. Basically you intercept a transmission cooler line to make a drain and keep filling from a fill port or the other side of the intercepted line until fluid that is new looking starts draining out. I am about to do this on a family member’s Nissan Frontier. On my M5, I did the drain and fill and plan to do it a second time soon.
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