Can you explain what benefits the average user would see from this?
WiFi 6/AX routers are available right now for consumers, and a good handful of them are in the reasonable price range for a router.
From a strictly speed perspective, the average consumer will see no benefit, but then again, neither would they with AC which has been mainstream for years.
There is a longer list of benefits, especially with multiple devices being on the network, and we're only each getting more of them as time goes on.
It's just a weird Apple thing, really. Latest iPhones released in September have WiFi 6 hardware, but their new MBA released 6 months later does not?