How are PCIe Expansion cards not way more popular

Best solution for SSD expansion card for NVMe m 2 expansion slot * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot Does this mean m2 nvme slot Buy M2 for KEY A E to M2 NVME Adapter Card M2 NVME to KEY-M Expansion Slot WIFI in at

m2 expansion slot expansion card that replaces the previous mSATA standard 2 slots for both types (SATA and NVMe drives are often keyed