iFixit Tears Down the 2019 MacBook Pro and Its Updated Butterfly Keyboard [Images]
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This is what I was afraid of, nothing but the trackpad is replaceable, meaning whichever SSD you select, you're stuck with. However, I've recently discovered external NVMe drives, which are significantly FASTER than internal SSDs, so I'll probably go with just enough memory/drive to keep apps open and store everything else externally, though it's a pain when using laptops.