How are PCIe Expansion cards not way more popular

How are PCIe Expansion cards not way more popular m2 expansion slot To me it feels like the most obvious logical next step is to push for controller chipsPCIe expansion cards that take gen 5 speeds and split it m2 slot mainboard The motherboard slot #2 shares bandwidth with several PCIe expansion slots When the slot is populated with a PCIe drive, four PCIe expansion

m2 slot mainboard The ToughArmor MB840M2P-B turns a PCIe 4x, 8x, or 16x expansion slot into a removable NVMe drive bay, allowing you to swap in NVMe SSDs without

m2 sata vs nvme slot The motherboard slot #2 shares bandwidth with several PCIe expansion slots When the slot is populated with a PCIe drive, four PCIe expansion Add-in Cards & Expansion Modules · x86 Tried and true x86 architecture based Ultimate Scalibility: 3*PCIe x16 slots for Multi-GPU and 4*PCIe x4 slots