The manufacturer of the device relies on their chipset manufacturer to update their drivers. Also the manufacturer has to them push out that as an update. ISP

The manufacturer of the device relies on their chipset manufacturer to update their drivers. Also the manufacturer has to them push out that as an update. ISPs often have custom firmwares on the routers so they need to do an update. Also every device needs to be able to talk to every device. Interoperability means that you get breaking changes being only acceptable when you go: N to AC to Wifi6 WPA3 came out but how many routers will support it? How many clients?