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The TX pins deeper into the array aren't so lucky. This is KiCAD's initial routing.

Let's just say I don't need to throw this in Sonnet to know that 25G NRZ isn't going to be happy on THIS. I could go fully single ended and route separate tracks for each leg but I still couldn't make them 380 μm for 50Ω single ended impedance, and the transition back to closely coupled would also be a pain.