I’m more concerned about why there are M.2 SATA III slots on the flagship product, whereas the CCR2116 has a proper M.2 PCIex3 slot. The supply of M.2 SATA will eventually die off and now I’ll have router with irreplaceable SATA disks.
Sometimes the screw is fastened on the mainboard itself - but sometimes the thread is onside one little piece, that we must assemble before use. Those cheap M.2 boards, used to add extra SSDs to an PCIe slot, usually work this way.