How are PCIe Expansion cards not way more popular

How are PCIe Expansion cards not way more popular pcie m2 slot 2 connector slot Depending on its type and functionality, an drive can make use of either the standard SATA interface or the faster PCIe ( pcie 4 slot AS2280Q4U's blazing-fast PCIe Gen4 x4 interface is fully compliant with the NVMe standard With sequential readwrite performance of up to 7,4007,000 MBs,

pcie 4 slot 2 SSD slot on your motherboard These slots are similar to PCIe expansion slots but are much smaller And this makes them perfect for SSD drives

pcie 40 in 30 slot SSD to PCIE Adapter Card for Key M 2230, 2242, 2260, 2280 Size SSD, Support PCIe x4 x8 x16 Slot 256 MB GDDR5 Graphics Card only for Rs 877 from 2 adapters provide one slot for PCIe, and one for SATA True dual PCIe cards have x8 connector, for example AOC-SLG3-2M2 To fully