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> Epyc systems support up to 24(!) of them.

Could probably do more assuming a headless storage-dedicated motherboard: IIRC EPYC only requires 4 lanes going to the chipset, if the mobo provides only U.2 slots and no PCIe (or alternatively lets you disable and reuse the PCIe lanes going to PCIe slots) it should support up to 31 drives.

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But then there would be no lanes for 10GbE+ networking right? I was going off the commercially available platforms such as https://www.dell.com/en-us/work/shop/povw/poweredge-r7415

Correct, you'd only get the chipset's IO. IIRC each 10Gb port would be 2 PCIe3 lanes (with some waste, you can run 100Gb on PCIe3x16).

corrected: 10GB -> 10Gbps, 100GB -> 100Gbps

You're completely right, fixed the suffix.

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