It's worth noting that the first gen of these (IIRC) split the four PCIe lanes from the TB3 controller across the drives, giving them one each, no matter the configuration. After all, there's no PLX chip there to mux the lanes, so 4 single-lane connections is all you get. That means you'll need some pretty heavy loads to match the performance of even a single NVMe m.2 x4 drive in an external TB3 enclosure. All you're gaining with this is added risk of drive failure and a TB3 passthrough.
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Valantar - Tuesday, February 5, 2019 - link
It's worth noting that the first gen of these (IIRC) split the four PCIe lanes from the TB3 controller across the drives, giving them one each, no matter the configuration. After all, there's no PLX chip there to mux the lanes, so 4 single-lane connections is all you get. That means you'll need some pretty heavy loads to match the performance of even a single NVMe m.2 x4 drive in an external TB3 enclosure. All you're gaining with this is added risk of drive failure and a TB3 passthrough.