Newbie firm plans $2,800 add-in card that holds up to 21 PCIe 4.0 SSDs, 168TB

Ars Technica

QNAP QM2-4P-384 Quad M.2 PCIe SSD Expansion Card, Supports up to Four M.2 2280 Form Factor M.2 PCIe (Gen3 x4) SSDs, PCIe Gen3 x8 Host Interface, Low-Profile Bracket pre-Loaded : Electronics

Ars Technica

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PCIe 4.0 Card Hosts 21 M.2 SSDs: Up To 168TB, 31 GB/s

Apex Storage Design

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QNAP QM2-2P-244A Dual M.2 22110/2280 Pcie SSD Expansion Card ( PCIe Gen2 X4), Low-Profile Bracket Pre-Loaded, Low-Profile Flat and Full-Height are Bundled 2 x SSD : Electronics

Why there aren't any PCI-E SSDs which use full width x16 lanes? I saw M.2 to AiC converters, but why there aren't any Add-in-Cards with SSD chips soldered directly on it that

PCIe 4.0 Card Hosts 21 M.2 SSDs: Up To 168TB, 31 GB/s