Your point is well made.
Many parts of the world have much better ISP service.
Here in the USA real high-speed Internet is not as greedily available.
My conne3ction is, by measurement, about 6Mb s over DSL. Yest serveral times a day I get timeouts and broken connections. Speed has less meaning g if you have to stoop and made repairs. My DSL modem eventually corrects the problem. So the rated speed is misleading at best.
Of interest, Australia has 100 Mbps service is many big metropolitan areas. It is by fiber. Reports for some users say it is dater than what the Global network delivers. Some say it is by a factor of ten. That sacks.
Now about Gigabit Internet. The term has been used by the big companies in there advertising to encourage people to open up the path for fiver optical distribution in reside4ntial neighbor hoods. Politicians and others hacve given the compoanies to dig up the streests or string cables or share tunnels so the fibber network can be installed. Not far from where I live they tore up a secdtio9n of land to install fiver. That was some time ago. There still is no fiber service anywhere is the suburb. Of course I do not live in Cupertino.
AT&T had made a big announcement that they would put fiber in Cupertino. To date, nobody there is claiming the present service is good enough. Think about it. Who needs Gigabit Internet service? Most movies are now streamed, not downloaded.
So why did AT&T make a big thing about Gigabit Internet to the home? IMHO it is just an attem
to get people to pay for the investment the company has made. Yest the fiber system has already paid for itself with non-internet services.
As you stated, the Wi-Fi with gigabit can be used for devices in the home that do not support a physical Ethernet cable.
Here is something also of interest.
Comcast opens WiFi network to all after Northern California quake
I am not sure what this means. It would seem that Co9mcast can use Wi-Fi outside a the house. No, not gigabit. But Wi-Fi outside of a house or biding.
For the record, microwaves are not limited to line of sight. That is a myth. The limitations are the regulations.